feat(cache): add Redis client module

app/redis_client.py

@@ -0,0 +1,31 @@
+import logging
+import redis
+from app.config import REDIS_HOST, REDIS_PORT, REDIS_DB, REDIS_PASSWORD
+
+logger = logging.getLogger(__name__)
+
+redis_client = None
+
+
+def init_redis():
+    """初始化 Redis 客户端，失败时返回 None"""
+    global redis_client
+    try:
+        redis_client = redis.Redis(
+            host=REDIS_HOST, port=REDIS_PORT, db=REDIS_DB,
+            password=REDIS_PASSWORD or None,
+            decode_responses=True,
+            socket_connect_timeout=5,
+        )
+        redis_client.ping()
+        logger.info("Redis 连接初始化成功")
+        return redis_client
+    except Exception as e:
+        logger.warning(f"Redis 初始化失败: {e}")
+        redis_client = None
+        return None
+
+
+def get_redis():
+    """获取 Redis 客户端实例"""
+    return redis_client