feat(wechat): add admin-pluggable LLM intent router separate from H5.

Give WeChat MP its own chat.general→page.generate LLM refinement layer with memindadm toggles, shadow mode, and canary openids so service account routing stays independent of the H5 chatIntentRouter.

Co-authored-by: Cursor <cursoragent@cursor.com>

admin-routes.mjs

@@ -42,6 +42,7 @@ function plazaRouteError(res, req, error) {
  * @param {object|null} deps.plazaPosts
  * @param {object|null} deps.plazaOps
  * @param {object|null} deps.wechatAdmin
+ * @param {object|null} deps.wechatIntentRouterConfigService
  */
 export function createAdminApi({
   jsonBody,
@@ -64,6 +65,7 @@ export function createAdminApi({
   plazaPosts,
   plazaOps,
   wechatAdmin,
+  wechatIntentRouterConfigService,
   subscriptionService,
 }) {
   function requireAdmin(req, res, next) {
@@ -838,6 +840,34 @@ export function createAdminApi({
     res.json(result);
   });
 
+  adminApi.get('/wechat/intent-router/config', requireAdmin, async (_req, res) => {
+    if (!wechatIntentRouterConfigService?.getConfig) {
+      return res.status(503).json({ message: '微信意图路由配置未启用' });
+    }
+    const config = await wechatIntentRouterConfigService.getConfig();
+    return res.json({ config });
+  });
+
+  adminApi.get('/wechat/intent-router/runtime', requireAdmin, async (_req, res) => {
+    if (!wechatIntentRouterConfigService?.getRuntimeState) {
+      return res.status(503).json({ message: '微信意图路由配置未启用' });
+    }
+    return res.json(await wechatIntentRouterConfigService.getRuntimeState());
+  });
+
+  const updateWechatIntentRouterConfig = async (req, res) => {
+    if (!wechatIntentRouterConfigService?.updateConfig) {
+      return res.status(503).json({ message: '微信意图路由配置未启用' });
+    }
+    const config = await wechatIntentRouterConfigService.updateConfig(req.body ?? {}, {
+      updatedBy: req.currentUser.id,
+    });
+    return res.json({ config });
+  };
+
+  adminApi.put('/wechat/intent-router/config', requireAdmin, updateWechatIntentRouterConfig);
+  adminApi.patch('/wechat/intent-router/config', requireAdmin, updateWechatIntentRouterConfig);
+
   adminApi.get('/llm-providers/catalog', requireAdmin, (_req, res) => {
     if (!llmProviderService) return res.status(503).json({ message: '未启用 LLM 配置' });
     res.json({ catalog: llmProviderService.catalog });