fix: 优化数据库连接关闭逻辑，确保资源正确释放并处理 Redis 关闭异常

DB.py

@@ -293,10 +293,22 @@ class DBVidcon:
         """批量执行完后手动提交。"""
         self.conn.commit()
 
-    @mysql_retry()
     def close(self):
-        self.cursor.close()
-        self.conn.close()
+        try:
+            if self.cursor:
+                self.cursor.close()
+        finally:
+            if self.conn:
+                self.conn.close()
+        try:
+            if hasattr(self, "redis") and self.redis:
+                # redis-py ≥ 4.2 推荐直接调用 .close()
+                if hasattr(self.redis, "close"):
+                    self.redis.close()
+                else:
+                    self.redis.connection_pool.disconnect()
+        except Exception as e:
+            print("[Redis close error]", e)
 
     @redis_retry(max_retries=3)
     def get_proxy(self, region_code: str) -> str: