feat(web): 插件侧边栏改为三级菜单结构 — 按插件名分组可折叠

插件菜单从扁平列表改为三级结构：
  插件（分组）→ 插件名（可折叠子标题）→ 页面列表

- store 新增 PluginMenuGroup 类型和 pluginMenuGroups getter
- MainLayout 新增 SidebarSubMenu 组件，支持展开/收起
- 折叠侧边栏时子菜单显示插件图标 + tooltip
- 子菜单项增加缩进样式区分层级
- CRM 插件 name 改为 "CRM" 避免与页面标题重名

apps/web/src/stores/plugin.ts

@@ -9,13 +9,19 @@ export interface PluginMenuItem {
   pluginId: string;
   entity?: string;
   pageType: 'crud' | 'tree' | 'tabs' | 'detail' | 'graph' | 'dashboard';
-  menuGroup?: string;
+}
+
+export interface PluginMenuGroup {
+  pluginId: string;
+  pluginName: string;
+  items: PluginMenuItem[];
 }
 
 interface PluginStore {
   plugins: PluginInfo[];
   loading: boolean;
   pluginMenuItems: PluginMenuItem[];
+  pluginMenuGroups: PluginMenuGroup[];
   schemaCache: Record<string, PluginSchemaResponse>;
   fetchPlugins: (page?: number, status?: PluginStatus) => Promise<void>;
   refreshMenuItems: () => void;
@@ -25,6 +31,7 @@ export const usePluginStore = create<PluginStore>((set, get) => ({
   plugins: [],
   loading: false,
   pluginMenuItems: [],
+  pluginMenuGroups: [],
   schemaCache: {},
 
   fetchPlugins: async (page = 1, status?: PluginStatus) => {
@@ -124,5 +131,23 @@ export const usePluginStore = create<PluginStore>((set, get) => ({
     }
 
     set({ pluginMenuItems: items });
+
+    // 按 pluginId 分组生成三级菜单（复用上方已解构的 plugins）
+    const groupMap = new Map<string, PluginMenuItem[]>();
+    for (const item of items) {
+      const list = groupMap.get(item.pluginId) || [];
+      list.push(item);
+      groupMap.set(item.pluginId, list);
+    }
+    const groups: PluginMenuGroup[] = [];
+    for (const [pluginId, groupItems] of groupMap) {
+      const plugin = plugins.find((p) => p.id === pluginId);
+      groups.push({
+        pluginId,
+        pluginName: plugin?.name || pluginId,
+        items: groupItems,
+      });
+    }
+    set({ pluginMenuGroups: groups });
   },
 }));