feat(skills,knowledge): 中文名补全与知识库沉淀支持可选大模型并明确大模型报错

技能中文名:
- 单个「AI 生成」与「一键补充中文名」均可在请求体 model_name 选择大模型
- 一键补充改为仅管理员开放
- _generate_skill_name_zh 在模型自身失败(构建/超时/API 报错)时抛
  SkillNameZhModelError,与模型返回无效名称区分;单个接口返回
  502「大模型报错,无法补全技能中文名」,批量在 model_error 中带回代表性报错

知识库沉淀:
- 对话保存到知识库 / 批量导入均新增可选 model_name(透传至 capture_thread
  → extract_thread_llm_multi)
- 批量返回 llm_fallback 计数;模型异常时仍按既有逻辑回退规则抽取并落草稿,
  前端明确提示「已改用规则抽取」(保存按钮保持后台异步)

前端新增 components/workspace/model-name-select.tsx 复用下拉(默认=系统配置模型)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

frontend-web/src/pages/KnowledgeBasePage.tsx

@@ -37,6 +37,7 @@ import {
   SelectValue,
 } from "@/components/ui/select";
 import { Textarea } from "@/components/ui/textarea";
+import { ModelNameSelect } from "@/components/workspace/model-name-select";
 import {
   useKnowledgeActions,
   useKnowledgeDuplicates,
@@ -241,6 +242,8 @@ function BatchImportDialog({
   const { batchIngest } = useKnowledgeActions();
   const [limit, setLimit] = useState(50);
   const [skipExisting, setSkipExisting] = useState(true);
+  // Optional model override for extraction (null = configured default).
+  const [model, setModel] = useState<string | null>(null);
 
   const handleRun = async () => {
     try {
@@ -249,10 +252,18 @@ function BatchImportDialog({
         skip_existing: skipExisting,
         status: "approved",
         include_sources: true,
+        model_name: model,
       });
-      toast.success(
-        `批量导入完成：新增 ${result.created}，跳过 ${result.skipped}，失败 ${result.failed}`,
-      );
+      const base = `批量导入完成：新增 ${result.created}，跳过 ${result.skipped}，失败 ${result.failed}`;
+      if (result.llm_fallback && result.llm_fallback > 0) {
+        // The model failed on some threads — they were saved via rule-based
+        // extraction instead. Say so explicitly per the requirement.
+        toast.warning(
+          `${base}；其中 ${result.llm_fallback} 条因大模型异常改用了规则抽取(草稿)`,
+        );
+      } else {
+        toast.success(base);
+      }
       onOpenChange(false);
     } catch (error) {
       toast.error(error instanceof Error ? error.message : "批量导入失败");
@@ -289,6 +300,15 @@ function BatchImportDialog({
               className="size-4"
             />
           </label>
+          <label className="flex items-center justify-between gap-2 text-sm">
+            提炼大模型
+            <ModelNameSelect
+              value={model}
+              onChange={setModel}
+              disabled={batchIngest.isPending}
+              triggerClassName="h-9 w-[11rem]"
+            />
+          </label>
         </div>
         <DialogFooter>
           <Button variant="outline" onClick={() => onOpenChange(false)}>