feat(frontend): 技能/专家广场展示调整 + 通知合并入设置菜单

- 技能与专家「广场」标签只展示内置和已发布项,Tab 顺序调为「我的」在前并默认选中
- 「智能体」全量更名为「专家」
- 通知由侧边栏铃铛改为「设置和更多」菜单内的弹窗入口,合并通知列表与通知设置

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

frontend-web/src/components/workspace/settings/skill-settings-page.tsx

@@ -92,7 +92,7 @@ function SkillSettingsList({
 }) {
   const { t } = useI18n();
   const router = useRouter();
-  const [filter, setFilter] = useState<string>("all");
+  const [filter, setFilter] = useState<string>("mine");
   const [installOpen, setInstallOpen] = useState(false);
   const [staleSheetOpen, setStaleSheetOpen] = useState(false);
   const [archiveSheetOpen, setArchiveSheetOpen] = useState(false);
@@ -101,9 +101,9 @@ function SkillSettingsList({
   const currentUserId = storedAuth?.user_id ?? null;
   const isAdmin = storedAuth?.system_role === "admin";
 
-  // Visible-to-me skills, classified into the three buckets the UI cares about.
-  // "All" = built-in + anyone-published-custom + mine (active state only).
-  // "Mine" = strictly my own custom skills (active state only).
+  // 把可见技能分类成 UI 关心的几个桶。
+  // "All" = 内置 + 已发布的技能（仅 active 状态);自己的技能也要自己发布了才出现。
+  // "Mine" = 严格属于我自己的自定义技能（仅 active 状态)。
   const { activeAll, activeMine, staleVisible, archivedVisible } = useMemo(() => {
     const all: Skill[] = [];
     const mine: Skill[] = [];
@@ -115,8 +115,6 @@ function SkillSettingsList({
       const isOwnedByMe =
         isCustom && !!skill.owner_user_id && skill.owner_user_id === currentUserId;
       const isBuiltin = skill.builtin ?? !skill.owner_user_id;
-      const isPublishedByOthers =
-        isCustom && !isOwnedByMe && !isBuiltin && !!skill.published;
 
       if (state === "stale") {
         stale.push(skill);
@@ -127,7 +125,7 @@ function SkillSettingsList({
         continue;
       }
       // state === active
-      if (!isCustom || isBuiltin || isOwnedByMe || isPublishedByOthers) {
+      if (isBuiltin || !!skill.published) {
         all.push(skill);
       }
       if (isOwnedByMe) {
@@ -156,8 +154,8 @@ function SkillSettingsList({
         <div className="flex flex-wrap items-center gap-2">
           <Tabs value={filter} onValueChange={setFilter}>
             <TabsList variant="line">
-              <TabsTrigger value="all">{t.settings.skills.tabAll}</TabsTrigger>
               <TabsTrigger value="mine">{t.settings.skills.tabMine}</TabsTrigger>
+              <TabsTrigger value="all">{t.settings.skills.tabAll}</TabsTrigger>
             </TabsList>
           </Tabs>
           <Button