fix(plugins): 插件管理 - 修正官方应用插件的分类与状态显示

AI 审美分析和剪辑工作台在管理页显示为"已停用"，原因是三处插件
分类清单不一致：

- 后端 officialApplicationPolicies 缺少 editor-shell
- 管理页 officialApplicationIds 同时缺少 ai-art-critique 和 editor-shell
- 用户插件页另有一份重复清单

后端把这两个插件当作系统协议处理（Kind=protocol），platformAvailable
回退为 false，于是返回"管理员已停用该插件"，管理页据此渲染成"已停用"。

修复：

- 后端补上 editor-shell 应用策略（权威修复，决定平台可用性）
- 前端抽取唯一清单 OFFICIAL_APPLICATION_PLUGIN_IDS，管理页与用户插件页
  共用，删除两份重复实现
- 补前后端回归测试，锁定这 8 个官方应用插件

验证：tsc --noEmit 通过；前端 17 项测试通过；后端 TestEditorShell* 与
既有插件测试通过；前后端镜像构建通过。

web/src/pages/admin/plugins/plugins-page.tsx

@@ -8,9 +8,8 @@ import { useEffect, useMemo, useState } from "react";
 import { PaginationBar } from "@/components/layout/workspace-page";
 import "@/lib/plugins/builtin";
 import { EAGLE_PLUGIN_ID } from "@/lib/plugins/builtin/eagle";
-import { PROMPT_OPTIMIZER_PLUGIN_ID } from "@/lib/plugins/builtin/prompt-optimizer";
 import { COMFYUI_PLUGIN_ID, RUNNINGHUB_PLUGIN_ID } from "@/lib/plugins/builtin/workflows";
-import { MEDIA_CONVERSION_PLUGIN_ID } from "@/lib/plugins/builtin/media-conversion";
+import { isOfficialApplicationPluginId } from "@/lib/plugins/official-applications";
 import { listRegisteredPlugins } from "@/lib/plugins/plugin-registry";
 import type { PluginManifest, PluginManifestV2 } from "@/lib/plugins/plugin-types";
 import { fetchAdminPlugins, setPluginPlatformAvailability, uninstallPlugin, uploadPlugin, type AdminPluginState, type BackendPlugin, type PluginManagement } from "@/services/api/plugins";
@@ -27,8 +26,6 @@ type AdminPluginItem = {
     error?: string;
 };
 
-const officialApplicationIds = new Set([RUNNINGHUB_PLUGIN_ID, COMFYUI_PLUGIN_ID, EAGLE_PLUGIN_ID, PROMPT_OPTIMIZER_PLUGIN_ID, "portrait-clearance", MEDIA_CONVERSION_PLUGIN_ID]);
-
 export default function AdminPluginsPage() {
     const { message, modal } = App.useApp();
     const [plugins, setPlugins] = useState<BackendPlugin[]>([]);
@@ -363,7 +360,7 @@ function PluginBrandIcon({ pluginId }: { pluginId: string }) {
 function mergePlugins(remote: BackendPlugin[]): AdminPluginItem[] {
     const byId = new Map<string, AdminPluginItem>();
     for (const plugin of listRegisteredPlugins()) {
-        const application = officialApplicationIds.has(plugin.manifest.id);
+        const application = isOfficialApplicationPluginId(plugin.manifest.id);
         byId.set(plugin.manifest.id, {
             manifest: plugin.manifest,
             source: plugin.source || "bundled",