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/components/workspace/settings/skill-settings-page.tsx

@@ -57,6 +57,7 @@ import {
 import { Input } from "@/components/ui/input";
 import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from "@/components/ui/select";
 import { Tabs, TabsList, TabsTrigger } from "@/components/ui/tabs";
+import { ModelNameSelect } from "@/components/workspace/model-name-select";
 import { SkillDetailDialog } from "@/components/workspace/skills/skill-detail-dialog";
 import { TagChipList } from "@/components/workspace/tags/tag-chip";
 import { TagPickerDialog } from "@/components/workspace/tags/tag-picker-dialog";
@@ -163,6 +164,8 @@ function SkillSettingsList({ onClose }: { onClose?: () => void }) {
   const [viewMode, setViewMode] = useViewMode("skill");
   const reconcileMutation = useReconcileCustomSkills();
   const fillNamesMutation = useGenerateMissingSkillNameZh();
+  // Optional model override for the admin "一键补充中文名" action (null = default).
+  const [fillModel, setFillModel] = useState<string | null>(null);
   // Name + tag filtering is resolved server-side via the /api/skills query.
   const { skills, isLoading, error } = useSkills({ search, tagIds, sort });
 
@@ -249,13 +252,18 @@ function SkillSettingsList({ onClose }: { onClose?: () => void }) {
 
   const handleFillNames = async () => {
     try {
-      const result = await fillNamesMutation.mutateAsync();
+      const result = await fillNamesMutation.mutateAsync(fillModel);
       const okCount = result.generated.length;
       const failCount = result.failed.length;
       if (okCount === 0 && failCount === 0) {
         toast.info("所有技能均已配置中文名称");
       } else if (failCount === 0) {
         toast.success(`已为 ${okCount} 个技能补充中文名称`);
+      } else if (result.model_error) {
+        // Failures came from the model itself — say so explicitly.
+        toast.warning(
+          `已补充 ${okCount} 个,${failCount} 个因大模型报错失败:${result.model_error}`,
+        );
       } else {
         toast.warning(`已补充 ${okCount} 个,${failCount} 个生成失败,可稍后重试或手动填写`);
       }
@@ -354,24 +362,37 @@ function SkillSettingsList({ onClose }: { onClose?: () => void }) {
               ? t.settings.skills.rescanSkillsRunning
               : t.settings.skills.rescanSkills}
           </Button>
-          <Button
-            size="sm"
-            variant="outline"
-            className="gap-1.5 border-violet-300 bg-violet-50 font-medium text-violet-700 hover:bg-violet-100 hover:text-violet-800 dark:border-violet-500/40 dark:bg-violet-500/15 dark:text-violet-300 dark:hover:bg-violet-500/25"
-            onClick={() => void handleFillNames()}
-            disabled={
-              fillNamesMutation.isPending ||
-              env.NEXT_PUBLIC_STATIC_WEBSITE_ONLY === "true"
-            }
-            title="用大模型为所有尚未配置中文名称的技能自动生成中文名"
-          >
-            {fillNamesMutation.isPending ? (
-              <Loader2 className="size-4 animate-spin" />
-            ) : (
-              <SparklesIcon className="size-4" />
-            )}
-            {fillNamesMutation.isPending ? "补充中…" : "一键补充中文名"}
-          </Button>
+          {isAdmin && (
+            <>
+              <ModelNameSelect
+                value={fillModel}
+                onChange={setFillModel}
+                disabled={
+                  fillNamesMutation.isPending ||
+                  env.NEXT_PUBLIC_STATIC_WEBSITE_ONLY === "true"
+                }
+                triggerClassName="h-8 w-[9.5rem]"
+              />
+              <Button
+                size="sm"
+                variant="outline"
+                className="gap-1.5 border-violet-300 bg-violet-50 font-medium text-violet-700 hover:bg-violet-100 hover:text-violet-800 dark:border-violet-500/40 dark:bg-violet-500/15 dark:text-violet-300 dark:hover:bg-violet-500/25"
+                onClick={() => void handleFillNames()}
+                disabled={
+                  fillNamesMutation.isPending ||
+                  env.NEXT_PUBLIC_STATIC_WEBSITE_ONLY === "true"
+                }
+                title="用所选大模型为所有尚未配置中文名称的技能自动生成中文名(仅管理员)"
+              >
+                {fillNamesMutation.isPending ? (
+                  <Loader2 className="size-4 animate-spin" />
+                ) : (
+                  <SparklesIcon className="size-4" />
+                )}
+                {fillNamesMutation.isPending ? "补充中…" : "一键补充中文名"}
+              </Button>
+            </>
+          )}
           <Button
             size="sm"
             variant="outline"