fix(database): filter out pool-specific parameters when using NullPool

- NullPool doesn't support pool_size, max_overflow, pool_timeout, pool_use_lifo
- Filter out these parameters to avoid TypeError on engine creation
- Keeps other configuration parameters like pool_recycle and pool_pre_ping

src/services/connection_pool_service.py

@@ -163,11 +163,17 @@ class ConnectionPoolService:
     ) -> AsyncEngine:
         """Create database connection pool."""
         try:
+            # Filter out pool-specific config when using NullPool
+            nullpool_config = {
+                k: v for k, v in config.items() 
+                if k not in ['pool_size', 'max_overflow', 'pool_timeout', 'pool_use_lifo']
+            }
+            
             # Create engine with async-compatible pool
             engine = create_async_engine(
                 url,
                 poolclass=NullPool,
-                **config
+                **nullpool_config
             )
             
             # Initialize stats