fix(wechat): resolve scheduled task cancel via manage LLM instead of hard rules

Use a lightweight LLM over active task lists to pick taskId for cancel,
exclude page.generate from scheduled-task inbound, and remove single-task
auto-cancel so Cursor page generation stays isolated.

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

server.mjs

@@ -285,6 +285,7 @@ let systemDisclosurePolicyService = null;
 let agentCodeRunPolicyService = null;
 let wechatCursorExecutorPolicyService = null;
 let wechatScheduleLlmConfigService = null;
+let wechatScheduledTaskManageLlmConfigService = null;
 let wechatIntentRouter = null;
 let mindSpace = null;
 let mindSpaceAssets = null;
@@ -481,6 +482,8 @@ async function bootstrapUserAuth() {
       memorySessionServices.wechatCursorExecutorPolicyService;
     wechatScheduleLlmConfigService =
       memorySessionServices.wechatScheduleLlmConfigService;
+    wechatScheduledTaskManageLlmConfigService =
+      memorySessionServices.wechatScheduledTaskManageLlmConfigService;
     wechatIntentRouter =
       memorySessionServices.wechatIntentRouter;
     conversationMemoryService =
@@ -545,6 +548,7 @@ async function bootstrapUserAuth() {
         taskUnifiedService,
         sessionSnapshotService,
         wechatScheduleLlmConfigService,
+        wechatScheduledTaskManageLlmConfigService,
         wechatIntentRouter,
         wechatCursorExecutorPolicyService,
         agentRunGateway,