feat(wechat): add subscribe morning reminder, plaza welcome, and LLM fallback

Enable daily morning greeting on reply 1 (with custom time, modify, and cancel),
random greeting delivery, M发现 in subscribe welcome, and optional LLM parsing when
rules miss. Also fix WeChat MP draft/config error passthrough and add Tang E2E scripts.

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

admin-bootstrap.mjs

@@ -37,6 +37,7 @@ import { createAgentCodeRunAdminConfigService } from './agent-code-run-admin-con
 import { createWechatCursorExecutorAdminConfigService } from './wechat-cursor-executor-admin-config.mjs';
 import { createMindSearchConfigService } from './mindsearch-config.mjs';
 import { createWechatScheduleLlmConfigService } from './wechat-schedule-llm-config.mjs';
+import { createWechatSubscribeMorningLlmConfigService } from './wechat-subscribe-morning-llm-config.mjs';
 import { createWechatIntentRouterConfigService } from './wechat-intent-router-config.mjs';
 import { createPlazaPostService, formatPostRow } from './plaza-posts.mjs';
 import { createPlazaInteractionService } from './plaza-interactions.mjs';
@@ -153,6 +154,7 @@ export async function createAdminServices(env = {}) {
   const agentCodeRunPolicyService = createAgentCodeRunAdminConfigService(pool, { env: process.env });
   const wechatCursorExecutorPolicyService = createWechatCursorExecutorAdminConfigService(pool);
   const wechatScheduleLlmConfigService = createWechatScheduleLlmConfigService(pool);
+  const wechatSubscribeMorningLlmConfigService = createWechatSubscribeMorningLlmConfigService(pool);
   const wechatIntentRouterConfigService = createWechatIntentRouterConfigService(pool);
   const adminSystemTestService = createAdminSystemTestService({
     pool,
@@ -202,6 +204,7 @@ export async function createAdminServices(env = {}) {
     agentCodeRunPolicyService,
     wechatCursorExecutorPolicyService,
     wechatScheduleLlmConfigService,
+    wechatSubscribeMorningLlmConfigService,
     wechatIntentRouterConfigService,
     adminSystemTestService,
     plazaPosts,