fix: harden AI analysis and seed defaults

modules/ai/components/KnowledgeManagementClient.tsx

@@ -66,12 +66,6 @@ function matchesEntry(entry: KnowledgeEntry, query: string): boolean {
   return [entry.title, entry.category, entry.tags, entry.body].join(" ").toLowerCase().includes(normalized);
 }
 
-function formatKnowledgeFailureReason(reason: string): string {
-  if (reason.includes("AI_API_KEY") || reason.includes("向量生成失败")) {
-    return `保存知识需要可用的 AI 向量配置：${reason}`;
-  }
-  return reason;
-}
 
 export function KnowledgeManagementClient({ initialEntries, permissions }: KnowledgeManagementClientProps): React.ReactElement {
   const [entries, setEntries] = useState(initialEntries);
@@ -142,7 +136,7 @@ export function KnowledgeManagementClient({ initialEntries, permissions }: Knowl
     const result = (await response.json()) as ApiResult<{ entry: KnowledgeEntry }>;
     setIsPending(false);
     if (!result.success) {
-      setMessage(formatKnowledgeFailureReason(result.reason));
+      setMessage(result.reason);
       return;
     }
 
@@ -180,7 +174,7 @@ export function KnowledgeManagementClient({ initialEntries, permissions }: Knowl
     });
     const result = (await response.json()) as ApiResult<{ entry: KnowledgeEntry }>;
     if (!result.success) {
-      setMessage(formatKnowledgeFailureReason(result.reason));
+      setMessage(result.reason);
       return;
     }
     await refreshEntries();
@@ -192,7 +186,7 @@ export function KnowledgeManagementClient({ initialEntries, permissions }: Knowl
       <section className="flex flex-col gap-4 border-b pb-5 lg:flex-row lg:items-end lg:justify-between">
         <div>
           <h1 className="text-3xl font-semibold tracking-normal">知识库</h1>
-          <p className="mt-2 text-sm text-muted-foreground">维护平台共享和机构私有知识，保存后会重建检索向量。</p>
+          <p className="mt-2 text-sm text-muted-foreground">维护平台共享和机构私有知识，保存后会重建本地关键词检索分块。</p>
         </div>
         <Button disabled={!canManage} onClick={beginCreate} type="button">
           <Plus className="size-4" aria-hidden="true" />
@@ -277,7 +271,7 @@ export function KnowledgeManagementClient({ initialEntries, permissions }: Knowl
       </Card>
 
       <Dialog
-        description="保存时会写入数据库、重建分块和 embedding。"
+        description="保存时会写入数据库并重建分块；检索使用本地关键词匹配。"
         onClose={closeDialog}
         open={isDialogOpen}
         title={isEditing ? "编辑知识" : "新增知识"}