Refactor Redis management and enhance system health callbacks

- Replaced the `RedisManager` class with a more modular `SyncRedisManager` and `AsyncRedisManager`, improving the separation of synchronous and asynchronous operations.
- Updated the `system_health.py` callbacks to utilize the new `get_sync_redis_manager` function for Redis interactions, simplifying the connection process.
- Enhanced error handling and logging in Redis status checks, providing clearer feedback on connection issues.
- Revised the setup documentation to reflect changes in Redis connection testing, ensuring clarity for users.

These updates improve the maintainability and reliability of Redis interactions within the system, aligning with best practices for modular design.

docs/guides/setup.md

@@ -337,34 +337,25 @@ Create a quick test script:
 ```python
 # test_connection.py
 import os
-import psycopg2
-import redis
-from dotenv import load_dotenv
+from database.connection import DatabaseManager
 
+# Load environment variables
+from dotenv import load_dotenv
 load_dotenv()
 
-# Test PostgreSQL
-try:
-    conn = psycopg2.connect(
-        host=os.getenv('POSTGRES_HOST'),
-        port=os.getenv('POSTGRES_PORT'),
-        database=os.getenv('POSTGRES_DB'),
-        user=os.getenv('POSTGRES_USER'),
-        password=os.getenv('POSTGRES_PASSWORD')
-    )
-    print("✅ PostgreSQL connection successful!")
-    conn.close()
-except Exception as e:
-    print(f"❌ PostgreSQL connection failed: {e}")
+# Test Database
+db = DatabaseManager()
+db.initialize()
+if db.test_connection():
+    print("✅ Database connection successful!")
+db.close()
 
 # Test Redis
+from database.redis_manager import get_sync_redis_manager
+
 try:
-    r = redis.Redis(
-        host=os.getenv('REDIS_HOST'),
-        port=int(os.getenv('REDIS_PORT')),
-        password=os.getenv('REDIS_PASSWORD')
-    )
-    r.ping()
+    redis_manager = get_sync_redis_manager()
+    redis_manager.initialize()
     print("✅ Redis connection successful!")
 except Exception as e:
     print(f"❌ Redis connection failed: {e}")