feat(web): Kanban 看板页面 — dnd-kit 拖拽 + 跨列移动

- 新增 PluginKanbanPage 看板页面，支持 dnd-kit 拖拽
- 支持泳道分组、卡片标题/副标题/标签展示
- 乐观更新 UI，失败自动回滚
- 路由入口 /plugins/:pluginId/kanban/:entityName 自加载 schema
- PluginTabsPage 新增 kanban 页面类型支持
- PluginStore 新增 kanban 菜单项和路由生成
- 安装 @dnd-kit/core + @dnd-kit/sortable

apps/web/src/App.tsx

@@ -20,6 +20,7 @@ const PluginTabsPage = lazy(() => import('./pages/PluginTabsPage').then((m) => (
 const PluginTreePage = lazy(() => import('./pages/PluginTreePage').then((m) => ({ default: m.PluginTreePage })));
 const PluginGraphPage = lazy(() => import('./pages/PluginGraphPage').then((m) => ({ default: m.PluginGraphPage })));
 const PluginDashboardPage = lazy(() => import('./pages/PluginDashboardPage').then((m) => ({ default: m.PluginDashboardPage })));
+const PluginKanbanPage = lazy(() => import('./pages/PluginKanbanPage'));
 
 function PrivateRoute({ children }: { children: React.ReactNode }) {
   const isAuthenticated = useAuthStore((s) => s.isAuthenticated);
@@ -146,6 +147,7 @@ export default function App() {
                       <Route path="/plugins/:pluginId/tree/:entityName" element={<PluginTreePage />} />
                       <Route path="/plugins/:pluginId/graph/:entityName" element={<PluginGraphPage />} />
                       <Route path="/plugins/:pluginId/dashboard" element={<PluginDashboardPage />} />
+                      <Route path="/plugins/:pluginId/kanban/:entityName" element={<PluginKanbanPage />} />
                       <Route path="/plugins/:pluginId/:entityName" element={<PluginCRUDPage />} />
                     </Routes>
                   </Suspense>