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>

mindspace.mjs

@@ -1,7 +1,8 @@
 import crypto from 'node:crypto';
+import { loadMindSpaceConfig } from './mindspace-config.mjs';
 
 export const DEFAULT_SPACE_QUOTA_BYTES = 5 * 1024 * 1024;
-export const DEFAULT_MAX_FILE_BYTES = 2 * 1024 * 1024;
+export const DEFAULT_MAX_FILE_BYTES = 5 * 1024 * 1024;
 
 export const SYSTEM_CATEGORIES = Object.freeze([
   {
@@ -141,8 +142,17 @@ export async function ensureDefaultSpaces(pool, options = {}) {
 export function createMindSpaceService(pool, options = {}) {
   const maxFileBytes = Number(options.maxFileBytes ?? DEFAULT_MAX_FILE_BYTES);
   const aiDailyLimit = Number(options.aiDailyLimit ?? 10);
-  const publicPageLimit = Number(options.publicPageLimit ?? 5);
+  const publicPageLimitFallback = Number(options.publicPageLimit ?? 5);
   const monthlyViewLimit = Number(options.monthlyViewLimit ?? 1000);
+  const scheduleService = options.scheduleService ?? null;
+  const resolvePublicPageLimit = async () => {
+    try {
+      const config = await loadMindSpaceConfig(pool);
+      return Number(config.publicPageLimit ?? publicPageLimitFallback);
+    } catch {
+      return publicPageLimitFallback;
+    }
+  };
 
   const getSpace = async (userId) => {
     const [spaces] = await pool.query(
@@ -190,6 +200,28 @@ export function createMindSpaceService(pool, options = {}) {
        FROM h5_publish_records WHERE user_id = ?`,
       [Date.now() - 30 * 24 * 60 * 60 * 1000, userId],
     );
+    const publicPageLimit = await resolvePublicPageLimit();
+    let schedule = null;
+    if (scheduleService) {
+      try {
+        const [todayTodoItems, digestSubscriptions] = await Promise.all([
+          typeof scheduleService.listTodayTodoItems === 'function'
+            ? scheduleService.listTodayTodoItems({ userId })
+            : Promise.resolve([]),
+          typeof scheduleService.listDigestSubscriptions === 'function'
+            ? scheduleService.listDigestSubscriptions({
+                userId,
+                digestType: 'todo_day',
+                status: ['active', 'locked'],
+                limit: 10,
+              })
+            : Promise.resolve([]),
+        ]);
+        schedule = { todayTodoItems, digestSubscriptions };
+      } catch {
+        schedule = null;
+      }
+    }
     return {
       id: row.id,
       userId: row.user_id,
@@ -211,6 +243,7 @@ export function createMindSpaceService(pool, options = {}) {
       categories: categories.map(categoryResponse),
       createdAt: asNumber(row.created_at),
       updatedAt: asNumber(row.updated_at),
+      schedule,
     };
   };