refactor(log): reduce verbosity of API request logging

Changes log level from info to debug for API request start and completion
messages to reduce noise in standard output while maintaining detailed
debugging capability.

Co-Authored-By: Claude <noreply@anthropic.com>

Author: S1M0N38

src/balatrobot/client.py

@@ -115,7 +115,7 @@ def _send_request(self, name: str, arguments: dict[str, Any]) -> dict[str, Any]:
 
         # Create and validate request
         request = APIRequest(name=name, arguments=arguments)
-        logger.info(f"Sending API request: {name}")
+        logger.debug(f"Sending API request: {name}")
 
         try:
             # Send request
@@ -131,7 +131,7 @@ def _send_request(self, name: str, arguments: dict[str, Any]) -> dict[str, Any]:
                 logger.error(f"API request {name} failed: {response_data.get('error')}")
                 raise create_exception_from_error_response(response_data)
 
-            logger.info(f"API request {name} completed successfully")
+            logger.debug(f"API request {name} completed successfully")
             return response_data
 
         except socket.error as e: