Add smart ACK provider for WeChat MP replies

Replace fixed ackText with a rule-based AckProvider that picks
response templates by message type and intent (translate, summary,
rewrite, poster, ppt, mindmap, code, search, schedule). Pure sync,
zero I/O, auto-falls back to config.ackText on any error.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

admin-bootstrap.mjs

@@ -12,6 +12,7 @@
 // The same factory functions imported here are the ones server.mjs uses, so the
 // domain logic has a single source of truth; only the wiring differs.
 import path from 'node:path';
+import { createSubscriptionService } from './billing-subscription.mjs';
 import { createDbPool, isDatabaseConfigured } from './db.mjs';
 import { createUserAuth } from './user-auth.mjs';
 import { createLlmProviderService } from './llm-providers.mjs';
@@ -21,7 +22,7 @@ import { createPlazaOpsService } from './plaza-ops.mjs';
 import { createNoopPlazaRedis } from './plaza-redis.mjs';
 import { ensureAlgorithmConfig, loadAlgorithmConfig } from './plaza-algorithm.mjs';
 import { createWechatAdminService } from './wechat-admin.mjs';
-import { loadWechatMpConfig } from './wechat-mp.mjs';
+import { createWechatMpService, loadWechatMpConfig } from './wechat-mp.mjs';
 
 const noop = () => {};
 
@@ -77,21 +78,38 @@ export async function createAdminServices(env = {}) {
   });
 
   // --- platform super-admin services ---
+  const subscriptionService = createSubscriptionService(pool);
   const userAuth = createUserAuth(pool, {
     usersRoot,
     h5Root,
     defaultSignupBalanceCents,
+    subscriptionService,
   });
   if (env.ensureAdminUser !== false) {
     await userAuth.ensureAdminUser();
   }
 
   const llmProviderService = createLlmProviderService(pool, { apiTarget, apiSecret });
+  const wechatMpConfig = loadWechatMpConfig();
+  const wechatMpService = createWechatMpService({
+    config: wechatMpConfig,
+    userAuth,
+    apiFetch: async () => {
+      throw new Error('admin bootstrap does not proxy WeChat chat sessions');
+    },
+  });
+  userAuth.setRechargeNotifier(async ({ userId, title, body }) => {
+    if (!wechatMpService?.enabled) return;
+    await wechatMpService.sendTextToUser(userId, `${title}\n${body}`.trim());
+  });
   const wechatAdmin = createWechatAdminService(pool, {
-    config: loadWechatMpConfig(),
+    config: wechatMpConfig,
     scheduleEnabled: process.env.H5_SCHEDULE_ENABLED === '1',
     reminderWorkerEnabled: process.env.H5_REMINDER_WORKER_ENABLED === '1',
+    sendWechatTextToUser: wechatMpService?.enabled
+      ? (userId, text) => wechatMpService.sendTextToUser(userId, text)
+      : null,
   });
 
-  return { pool, userAuth, llmProviderService, plazaPosts, plazaOps, wechatAdmin };
+  return { pool, userAuth, llmProviderService, plazaPosts, plazaOps, wechatAdmin, subscriptionService };
 }