Fix: Add ping method to RedisClient for health checks

src/api/clients/redis_client.py

@@ -37,6 +37,10 @@ class RedisClient:
             logger.error("redis_connection_failed", error=str(e))
             raise
 
+    async def disconnect(self):
+        """Disconnect Redis (alias for close)"""
+        await self.close()
+
     async def close(self):
         """Close Redis connections"""
         try:
@@ -48,6 +52,15 @@ class RedisClient:
         except Exception as e:
             logger.error("redis_close_failed", error=str(e))
 
+    async def ping(self) -> bool:
+        """Ping Redis to check connectivity"""
+        if not self._client:
+            return False
+        try:
+            return await self._client.ping()
+        except Exception:
+            return False
+
     async def get(self, key: str) -> Optional[str]:
         """Get value by key"""
         if not self._client: