feat(skills): curator 健壮性加固 + 评审模型可配置 + 手动触发体验

调度健壮性:
- 技能进化总开关 skill_evolution.enabled 真正生效;CuratorConfig
  与 CuratorSubConfig 默认 enabled 改为 false(显式 opt-in)
- 新增 per-user 运行锁(.curator_state 的 running/started_at),
  防定时器与手动触发并发重复运行;6h stale 检测防进程残留死锁
- maybe_run_curator 改用 ThreadPoolExecutor 限并发(上限 5),
  防首次部署所有用户同时到期的惊群
- 首次运行持续失败时按 6h 退避重试,不再每个 tick 烧 LLM 配额
- should_run_now 时间解析容忍 naive 时间串;损坏的 last_run_at
  触发重跑而非永久死锁
- SkillStore 新增 list_published_names 批量接口,curator 一轮
  只查一次 published,取代逐技能查库

LLM 评审超时:
- _run_llm_review 给 agent.invoke 套整体超时
  (curator.review_timeout_seconds,默认 600s),超时中止本次评审
  并在 curator 日志输出,curator 正常收尾、释放运行锁
- copy_context 把 user 上下文传入工作线程

模型可配置:
- 新增 curator.model_name;curator 评审与技能安全审核共用该模型,
  未配置则回退主模型
- 移除独立的 moderation_model_name 配置
- 前端进化面板新增模型下拉选择器

手动触发体验:
- /api/curator/run 派发后台线程前先预检,返回 {triggered, reason},
  不再无论开关状态都提示"已开始"
- 前端:总开关/curator 开关未开时禁用"立即执行"按钮,
  被预检拦下时按原因(开关未开 / 已有任务在跑)给出准确提示

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

frontend-web/src/components/workspace/skills/skill-evolution-panel.tsx

@@ -21,6 +21,13 @@ import {
   CardTitle,
 } from "@/components/ui/card";
 import { Input } from "@/components/ui/input";
+import {
+  Select,
+  SelectContent,
+  SelectItem,
+  SelectTrigger,
+  SelectValue,
+} from "@/components/ui/select";
 import { Switch } from "@/components/ui/switch";
 import {
   useCuratorConfig,
@@ -31,6 +38,7 @@ import {
 } from "@/core/curator/hooks";
 import type { CuratorConfig } from "@/core/curator/types";
 import { useI18n } from "@/core/i18n/hooks";
+import { useModels } from "@/core/models/hooks";
 import { cn } from "@/lib/utils";
 
 export function SkillEvolutionPanel() {
@@ -68,6 +76,7 @@ function StatusCard() {
   const { t } = useI18n();
   const tt = t.settings.skillEvolution.status;
   const { status, isLoading } = useCuratorStatus();
+  const { config } = useCuratorConfig();
   const runCurator = useRunCurator();
 
   const lastRunDisplay = useMemo(() => {
@@ -79,10 +88,25 @@ function StatusCard() {
     }
   }, [status?.last_run_at, tt.lastRunNever]);
 
+  // 总开关或 curator 子开关任一关闭时,手动触发跑不起来 —— 直接禁用按钮。
+  const runDisabled = !config || !config.enabled || !config.curator.enabled;
+
   const handleRun = async () => {
     try {
-      await runCurator.mutateAsync();
-      toast.success(tt.runStarted);
+      const res = await runCurator.mutateAsync();
+      if (res.triggered) {
+        toast.success(tt.runStarted);
+      } else {
+        // 后端预检拦下了(开关未开 / 已有任务在跑)—— 给出对应原因,而不是误报"已开始"。
+        const reasonMsg: Record<string, string> = {
+          evolution_disabled: tt.runBlockedEvolutionDisabled,
+          curator_disabled: tt.runBlockedCuratorDisabled,
+          already_running: tt.runBlockedAlreadyRunning,
+        };
+        toast.warning(
+          reasonMsg[res.reason ?? ""] ?? tt.runBlockedEvolutionDisabled,
+        );
+      }
     } catch (err) {
       toast.error(err instanceof Error ? err.message : String(err));
     }
@@ -107,7 +131,8 @@ function StatusCard() {
         <Button
           size="sm"
           onClick={handleRun}
-          disabled={runCurator.isPending}
+          disabled={runCurator.isPending || runDisabled}
+          title={runDisabled ? tt.runDisabledHint : undefined}
         >
           {runCurator.isPending ? (
             <Loader2Icon className="size-4 animate-spin" />
@@ -245,11 +270,15 @@ function StatRow({
   );
 }
 
+/** Select 不允许空字符串 value,用此哨兵代表"用主模型"(对应 model_name=null)。 */
+const DEFAULT_MODEL_VALUE = "__default__";
+
 function ConfigCard() {
   const { t } = useI18n();
   const tt = t.settings.skillEvolution.config;
   const { config, isLoading } = useCuratorConfig();
   const updateConfig = useUpdateCuratorConfig();
+  const { models } = useModels();
 
   const [draft, setDraft] = useState<CuratorConfig | null>(null);
   useEffect(() => {
@@ -378,22 +407,35 @@ function ConfigCard() {
           />
         </FieldRow>
         <FieldRow
-          label={tt.moderationModelLabel}
-          helper={tt.moderationModelHelper}
+          label={tt.curatorModelLabel}
+          helper={tt.curatorModelHelper}
         >
-          <Input
-            type="text"
-            className="max-w-[20rem]"
-            value={draft.moderation_model_name ?? ""}
-            placeholder=""
-            onChange={(e) =>
+          <Select
+            value={draft.curator.model_name ?? DEFAULT_MODEL_VALUE}
+            onValueChange={(v) =>
               setDraft({
                 ...draft,
-                moderation_model_name:
-                  e.target.value.trim() === "" ? null : e.target.value,
+                curator: {
+                  ...draft.curator,
+                  model_name: v === DEFAULT_MODEL_VALUE ? null : v,
+                },
               })
             }
-          />
+          >
+            <SelectTrigger className="max-w-[20rem]">
+              <SelectValue />
+            </SelectTrigger>
+            <SelectContent>
+              <SelectItem value={DEFAULT_MODEL_VALUE}>
+                {tt.curatorModelDefault}
+              </SelectItem>
+              {models.map((m) => (
+                <SelectItem key={m.name} value={m.name}>
+                  {m.display_name || m.name}
+                </SelectItem>
+              ))}
+            </SelectContent>
+          </Select>
         </FieldRow>
 
         <div className="flex justify-end gap-2 pt-2">