refactor(message): replace synchronous Redis client with asynchronous client

app/dependencies/database.py

@@ -9,7 +9,6 @@ from app.config import settings
 
 from fastapi import Depends
 from pydantic import BaseModel
-import redis as sync_redis
 import redis.asyncio as redis
 from sqlalchemy.ext.asyncio import create_async_engine
 from sqlmodel import SQLModel
@@ -41,8 +40,8 @@ redis_client = redis.from_url(settings.redis_url, decode_responses=True)
 # Redis 二进制数据连接 (不自动解码响应，用于存储音频等二进制数据)
 redis_binary_client = redis.from_url(settings.redis_url, decode_responses=False)
 
-# Redis 消息缓存连接 (db1) - 使用同步客户端在线程池中执行
-redis_message_client = sync_redis.from_url(settings.redis_url, decode_responses=True, db=1)
+# Redis 消息缓存连接 (db1)
+redis_message_client: redis.Redis = redis.from_url(settings.redis_url, decode_responses=True, db=1)
 
 
 # 数据库依赖
@@ -97,7 +96,7 @@ def get_redis_binary():
     return redis_binary_client
 
 
-def get_redis_message():
+def get_redis_message() -> redis.Redis:
     """获取消息专用的 Redis 客户端 (db1)"""
     return redis_message_client