修复定时任务日志和增强功能

1. 修复定时任务日志字段映射问题
   - 修正execute_time → created_at
   - 修正success_accounts → success_count
   - 修正failed_accounts → failed_count
   - 修正duration_seconds → duration
   - 位置: database.py 第1661-1686行

2. 添加定时任务调试日志
   - 显示当前检查时间和任务匹配情况
   - 帮助诊断定时任务不执行问题
   - 位置: app.py 第2869-2875行

3. 新增VIP权限对比表格
   - 在VIP信息弹窗中添加权限对比
   - 对比普通用户和VIP用户的6项权限
   - 位置: templates/index.html 第549-593行

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

database.py

@@ -1663,7 +1663,22 @@ def get_schedule_execution_logs(schedule_id, limit=10):
     with db_pool.get_db() as conn:
         cursor = conn.cursor()
         cursor.execute('''
-            SELECT * FROM schedule_execution_logs
+            SELECT
+                id,
+                schedule_id,
+                user_id,
+                schedule_name,
+                execute_time as created_at,
+                total_accounts,
+                success_accounts as success_count,
+                failed_accounts as failed_count,
+                total_items,
+                total_attachments,
+                total_screenshots,
+                duration_seconds as duration,
+                status,
+                error_message
+            FROM schedule_execution_logs
             WHERE schedule_id = ?
             ORDER BY execute_time DESC
             LIMIT ?