feat: Add comprehensive logging system with console and file output

- Create logging infrastructure in src/infrastructure/logging/
  - logger.py: Main logging setup with console and file handlers
  - uvicorn_config.py: Custom uvicorn logging configuration
  - __init__.py: Export public logging API

- Update FastAPI application to use logging
  - Replace all print() statements with proper logger calls
  - Initialize logging during application startup
  - Add detailed startup/shutdown logging

- Add startup scripts
  - run_server.py: Python script with uvicorn logging config
  - start_server.sh: Bash wrapper script

- Add comprehensive documentation
  - docs/logging.md: User guide for logging system
  - docs/logging_implementation_summary.md: Technical implementation details

Features:
- Console logging with clean, readable format
- File logging with timestamps to logs/fastapi_app.log
- Configurable log level via LOG_LEVEL environment variable
- Proper lazy formatting for performance
- Captures all uvicorn, application, and module logs
- Automatic log directory creation

src/infrastructure/logging/__init__.py

@@ -0,0 +1,7 @@
+"""
+Logging infrastructure for the Aniworld application.
+"""
+from src.infrastructure.logging.logger import get_logger, setup_logging
+from src.infrastructure.logging.uvicorn_config import get_uvicorn_log_config
+
+__all__ = ["setup_logging", "get_logger", "get_uvicorn_log_config"]