Refactor metadata handling to use unified provider system

- Replaced direct usage of Civitai client with a fallback metadata provider across all recipe parsers.
- Updated metadata service to improve initialization and error handling.
- Enhanced download manager to utilize a downloader service for file operations.
- Improved recipe scanner to fetch model information through the new metadata provider.
- Updated utility functions to streamline image downloading and processing.
- Added comprehensive logging and error handling for better debugging and reliability.
- Introduced `get_default_metadata_provider()` for simplified access to the default provider.
- Ensured backward compatibility with existing APIs and workflows.

py/services/settings_manager.py

@@ -81,7 +81,7 @@ class SettingsManager:
         return {
             "civitai_api_key": "",
             "show_only_sfw": False,
-            "language": "en",  # 添加默认语言设置
+            "language": "en",
             "enable_metadata_archive_db": False,  # Enable metadata archive database
             "metadata_provider_priority": "archive_db"  # Default priority: 'archive_db' or 'civitai_api'
         }