feat: system knowledge base management with admin/user role separation

- Auto-create system KBs from data/knowledge_base/ subdirectories on startup
- Upgrade existing user KBs to system KBs when matching directory found
- Admin can upload to system KBs (saved to knowledge_base dir)
- Regular users see only their own KBs on knowledge page
- Fix API permission checks for system KBs (list, detail, documents, update, delete)
- Add is_superuser to UserResponse and frontend User type
- Fix sidebar session menu visibility for long titles

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

web/src/app/(main)/knowledge/page.tsx

@@ -30,7 +30,7 @@ import { KnowledgeBase } from "@/types";
 
 export default function KnowledgePage() {
   const router = useRouter();
-  const { isAuthenticated, isLoading: authLoading } = useAuthStore();
+  const { isAuthenticated, isLoading: authLoading, user } = useAuthStore();
   const [knowledgeBases, setKnowledgeBases] = useState<KnowledgeBase[]>([]);
   const [isLoading, setIsLoading] = useState(true);
   const [searchQuery, setSearchQuery] = useState("");
@@ -58,9 +58,7 @@ export default function KnowledgePage() {
       setIsLoading(true);
       setError(null);
       const bases = await knowledgeBaseAPI.getKnowledgeBases();
-      // 过滤掉系统知识库，只显示用户创建的知识库
-      const userBases = bases.filter(kb => !kb.is_system);
-      setKnowledgeBases(userBases);
+      setKnowledgeBases(bases);
     } catch (err) {
       console.error("加载知识库失败:", err);
       setError("加载知识库失败");
@@ -114,6 +112,10 @@ export default function KnowledgePage() {
     (kb.description && kb.description.toLowerCase().includes(searchQuery.toLowerCase()))
   );
 
+  const isAdmin = user?.is_superuser === true;
+  const systemKBs = isAdmin ? filteredKnowledgeBases.filter(kb => kb.is_system) : [];
+  const userKBs = filteredKnowledgeBases.filter(kb => !kb.is_system);
+
   if (authLoading || isLoading) {
     return (
       <div className="min-h-screen flex items-center justify-center">
@@ -213,13 +215,80 @@ export default function KnowledgePage() {
               />
             </div>
             <div className="text-sm text-muted-foreground">
-              共 {filteredKnowledgeBases.length} 个知识库
+              共 {userKBs.length} 个知识库{systemKBs.length > 0 ? `，${systemKBs.length} 个系统知识库` : ""}
             </div>
           </div>
         </div>
 
-        {/* 知识库列表 */}
-        {filteredKnowledgeBases.length === 0 ? (
+        {/* 系统知识库 */}
+        {systemKBs.length > 0 && (
+          <div className="mb-8">
+            <div className="flex items-center space-x-2 mb-4">
+              <FolderOpen className="w-5 h-5 text-amber-600" />
+              <h2 className="text-lg font-semibold">系统知识库</h2>
+              <span className="text-sm text-muted-foreground">({systemKBs.length})</span>
+            </div>
+            <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-6">
+              {systemKBs.map((kb) => (
+                <Card key={kb.id} className="hover:shadow-lg transition-shadow backdrop-blur-sm bg-card/80 border-amber-500/30">
+                  <CardHeader>
+                    <div className="flex items-start justify-between">
+                      <div className="flex items-center space-x-2">
+                        <FolderOpen className="w-5 h-5 text-amber-600" />
+                        <div>
+                          <CardTitle className="text-lg">{kb.name}</CardTitle>
+                          <CardDescription className="text-sm">
+                            {kb.description || "系统知识库"}
+                          </CardDescription>
+                        </div>
+                      </div>
+                      <div className="flex items-center space-x-1">
+                        {kb.document_count > 0 ? (
+                          <CheckCircle className="w-4 h-4 text-green-600" />
+                        ) : (
+                          <Clock className="w-4 h-4 text-gray-400" />
+                        )}
+                      </div>
+                    </div>
+                  </CardHeader>
+                  <CardContent>
+                    <div className="space-y-2">
+                      <div className="flex justify-between text-sm text-muted-foreground">
+                        <span>文档数量</span>
+                        <span>{kb.document_count} 个文档</span>
+                      </div>
+                      <div className="flex justify-between text-sm text-muted-foreground">
+                        <span>创建时间</span>
+                        <span>{formatDate(kb.created_at)}</span>
+                      </div>
+                      <div className="flex justify-between text-sm">
+                        <span>状态</span>
+                        <span className={kb.document_count > 0 ? "text-green-600" : "text-gray-500"}>
+                          {kb.document_count > 0 ? "已就绪" : "空知识库"}
+                        </span>
+                      </div>
+                    </div>
+
+                    <div className="flex space-x-2 mt-4">
+                      <Button
+                        variant="outline"
+                        size="sm"
+                        className="flex-1"
+                        onClick={() => router.push(`/knowledge/${kb.id}`)}
+                      >
+                        <Settings className="w-4 h-4 mr-1" />
+                        管理
+                      </Button>
+                    </div>
+                  </CardContent>
+                </Card>
+              ))}
+            </div>
+          </div>
+        )}
+
+        {/* 用户知识库 */}
+        {userKBs.length === 0 && systemKBs.length === 0 ? (
           <Card className="backdrop-blur-sm bg-card/80 border-border/50 shadow-xl">
             <CardContent className="text-center py-12">
               <BookOpen className="w-12 h-12 text-muted-foreground mx-auto mb-4" />
@@ -238,70 +307,81 @@ export default function KnowledgePage() {
             </CardContent>
           </Card>
         ) : (
-          <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-6">
-            {filteredKnowledgeBases.map((kb) => (
-              <Card key={kb.id} className="hover:shadow-lg transition-shadow backdrop-blur-sm bg-card/80 border-border/50">
-                <CardHeader>
-                  <div className="flex items-start justify-between">
-                    <div className="flex items-center space-x-2">
-                      <BookOpen className="w-5 h-5 text-blue-600" />
-                      <div>
-                        <CardTitle className="text-lg">{kb.name}</CardTitle>
-                        <CardDescription className="text-sm">
-                          {kb.description || "暂无描述"}
-                        </CardDescription>
+          userKBs.length > 0 && (
+            <div>
+              {systemKBs.length > 0 && (
+                <div className="flex items-center space-x-2 mb-4">
+                  <BookOpen className="w-5 h-5 text-blue-600" />
+                  <h2 className="text-lg font-semibold">我的知识库</h2>
+                  <span className="text-sm text-muted-foreground">({userKBs.length})</span>
+                </div>
+              )}
+              <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-6">
+                {userKBs.map((kb) => (
+                  <Card key={kb.id} className="hover:shadow-lg transition-shadow backdrop-blur-sm bg-card/80 border-border/50">
+                    <CardHeader>
+                      <div className="flex items-start justify-between">
+                        <div className="flex items-center space-x-2">
+                          <BookOpen className="w-5 h-5 text-blue-600" />
+                          <div>
+                            <CardTitle className="text-lg">{kb.name}</CardTitle>
+                            <CardDescription className="text-sm">
+                              {kb.description || "暂无描述"}
+                            </CardDescription>
+                          </div>
+                        </div>
+                        <div className="flex items-center space-x-1">
+                          {kb.document_count > 0 ? (
+                            <CheckCircle className="w-4 h-4 text-green-600" />
+                          ) : (
+                            <Clock className="w-4 h-4 text-gray-400" />
+                          )}
+                        </div>
                       </div>
-                    </div>
-                    <div className="flex items-center space-x-1">
-                      {kb.document_count > 0 ? (
-                        <CheckCircle className="w-4 h-4 text-green-600" />
-                      ) : (
-                        <Clock className="w-4 h-4 text-gray-400" />
-                      )}
-                    </div>
-                  </div>
-                </CardHeader>
-                <CardContent>
-                  <div className="space-y-2">
-                    <div className="flex justify-between text-sm text-muted-foreground">
-                      <span>文档数量</span>
-                      <span>{kb.document_count} 个文档</span>
-                    </div>
-                    <div className="flex justify-between text-sm text-muted-foreground">
-                      <span>创建时间</span>
-                      <span>{formatDate(kb.created_at)}</span>
-                    </div>
-                    <div className="flex justify-between text-sm">
-                      <span>状态</span>
-                      <span className={kb.document_count > 0 ? "text-green-600" : "text-gray-500"}>
-                        {kb.document_count > 0 ? "已就绪" : "空知识库"}
-                      </span>
-                    </div>
-                  </div>
-                  
-                  <div className="flex space-x-2 mt-4">
-                    <Button 
-                      variant="outline" 
-                      size="sm" 
-                      className="flex-1"
-                      onClick={() => router.push(`/knowledge/${kb.id}`)}
-                    >
-                      <Settings className="w-4 h-4 mr-1" />
-                      管理
-                    </Button>
-                    <Button 
-                      variant="outline" 
-                      size="sm"
-                      onClick={() => handleDeleteKnowledgeBase(kb.id)}
-                      className="text-red-600 hover:text-red-700"
-                    >
-                      <Trash2 className="w-4 h-4" />
-                    </Button>
-                  </div>
-                </CardContent>
-              </Card>
-            ))}
-          </div>
+                    </CardHeader>
+                    <CardContent>
+                      <div className="space-y-2">
+                        <div className="flex justify-between text-sm text-muted-foreground">
+                          <span>文档数量</span>
+                          <span>{kb.document_count} 个文档</span>
+                        </div>
+                        <div className="flex justify-between text-sm text-muted-foreground">
+                          <span>创建时间</span>
+                          <span>{formatDate(kb.created_at)}</span>
+                        </div>
+                        <div className="flex justify-between text-sm">
+                          <span>状态</span>
+                          <span className={kb.document_count > 0 ? "text-green-600" : "text-gray-500"}>
+                            {kb.document_count > 0 ? "已就绪" : "空知识库"}
+                          </span>
+                        </div>
+                      </div>
+
+                      <div className="flex space-x-2 mt-4">
+                        <Button
+                          variant="outline"
+                          size="sm"
+                          className="flex-1"
+                          onClick={() => router.push(`/knowledge/${kb.id}`)}
+                        >
+                          <Settings className="w-4 h-4 mr-1" />
+                          管理
+                        </Button>
+                        <Button
+                          variant="outline"
+                          size="sm"
+                          onClick={() => handleDeleteKnowledgeBase(kb.id)}
+                          className="text-red-600 hover:text-red-700"
+                        >
+                          <Trash2 className="w-4 h-4" />
+                        </Button>
+                      </div>
+                    </CardContent>
+                  </Card>
+                ))}
+              </div>
+            </div>
+          )
         )}
       </div>
       

web/src/components/chat/export-dialog.tsx

@@ -1,7 +1,7 @@
 "use client";
 
 import { useState } from "react";
-import { Download, FileText, FileJson, File } from "lucide-react";
+import { Download, FileText, FileJson } from "lucide-react";
 import { Button } from "@/components/ui/button";
 import {
   Dialog,
@@ -61,12 +61,6 @@ export default function ExportDialog({ sessionId, sessionTitle, children, onClos
       description: "可读性好的文本格式，适合分享",
       icon: FileText,
     },
-    {
-      value: "pdf",
-      label: "PDF 格式",
-      description: "适合打印和正式文档",
-      icon: File,
-    },
   ];
 
   return (

web/src/components/chat/message-item.tsx

@@ -11,7 +11,7 @@ import { format } from "date-fns";
 import { Button } from "@/components/ui/button";
 import { useChatStore } from "@/store/chat";
 import SourceReferences from "./source-references";
-import { useState } from "react";
+import { useState, useEffect } from "react";
 import { toast } from "sonner";
 
 interface MessageItemProps {
@@ -21,6 +21,7 @@ interface MessageItemProps {
 
 const ThinkingProcess = ({ thinking, isStreaming }: { thinking: ThinkingStep[]; isStreaming?: boolean }) => {
   const [expanded, setExpanded] = useState(false);
+
   if (!thinking || thinking.length === 0) return null;
 
   // 只提取有实际内容的步骤：推理内容和检索文档
@@ -32,6 +33,11 @@ const ThinkingProcess = ({ thinking, isStreaming }: { thinking: ThinkingStep[];
   // 没有推理内容也没有文档详情时不显示
   if (!hasReasoning && !hasDocs && !isStreaming) return null;
 
+  // 流式生成时自动展开，完成后自动收起
+  useEffect(() => {
+    setExpanded(!!isStreaming);
+  }, [isStreaming]);
+
   // 合并推理文本
   const reasoningText = reasoningSteps.map(s => s.message).join('');
 

web/src/components/chat/sidebar.tsx

@@ -13,6 +13,7 @@ import {
   Download,
   Search,
   MoreVertical,
+  PanelLeftClose,
 } from "lucide-react";
 import {
   DropdownMenu,
@@ -121,9 +122,13 @@ export default function Sidebar({ onClose }: SidebarProps) {
       <div className="px-3 pt-4 pb-3 space-y-3 border-b border-border/30">
         <div className="flex items-center justify-between px-1">
           <span className="text-sm font-semibold text-foreground">对话</span>
-          <Button onClick={handleNewChat} size="sm" variant="ghost" className="h-7 w-7 p-0 hover:bg-primary/10 hover:text-primary">
-            <Plus className="w-4 h-4" />
-          </Button>
+          <button
+            onClick={onClose}
+            className="h-7 w-7 flex items-center justify-center rounded-md text-muted-foreground hover:text-foreground hover:bg-muted/50 transition-colors"
+            title="收起侧边栏"
+          >
+            <PanelLeftClose className="w-4 h-4" />
+          </button>
         </div>
         <div className="relative">
           <Search className="absolute left-2.5 top-1/2 -translate-y-1/2 w-3.5 h-3.5 text-muted-foreground" />

web/src/types/index.ts

@@ -5,6 +5,7 @@ export interface User {
   email: string;
   full_name?: string;
   is_active: boolean;
+  is_superuser?: boolean;
   created_at: string;
 }