优化：Redis 连接增强 — TCP keepalive 适配 + 截图处理器独立重连

- 新增 _build_keepalive_options() 适配 Linux/Windows TCP keepalive
- health_check_interval 30→15秒，更快发现断连
- 截图处理器新增 _reconnect_cloud_redis() 独立重连能力
- 截图监听捕获 ConnectionError 主动重连，不再退避到60秒

core/config_sync.py

@@ -14,6 +14,8 @@
 import json
 import logging
 import os
+import platform
+import socket
 import threading
 import time
 from datetime import datetime
@@ -30,6 +32,23 @@ from utils.version_control import get_version_control
 logger = logging.getLogger(__name__)
 
 
+def _build_keepalive_options():
+    """构建 TCP keepalive 选项，适配 Linux/Windows"""
+    opts = {}
+    if platform.system() == "Linux":
+        # TCP_KEEPIDLE: 连接空闲 15s 后开始发送 keepalive 探测
+        # TCP_KEEPINTVL: 每次探测间隔 5s
+        # TCP_KEEPCNT: 连续 3 次探测失败则判定断连
+        opts = {
+            socket.TCP_KEEPIDLE: 15,
+            socket.TCP_KEEPINTVL: 5,
+            socket.TCP_KEEPCNT: 3,
+        }
+    # Windows 不支持 TCP_KEEPIDLE/KEEPINTVL/KEEPCNT，
+    # 但 socket_keepalive=True 仍会启用默认 keepalive
+    return opts
+
+
 # ==================== Redis Key 常量 ====================
 
 # 云端 Redis Keys
@@ -207,7 +226,8 @@ class ConfigSyncManager:
                 socket_timeout=10,
                 retry_on_timeout=True,
                 socket_keepalive=True,
-                health_check_interval=30,
+                socket_keepalive_options=_build_keepalive_options(),
+                health_check_interval=15,
             )
             self._cloud_redis.ping()
             logger.info(f"云端 Redis 连接成功: {cfg.host}:{cfg.port}/{cfg.db}")