feat: implement plugin architecture and application settings with Svelte UI

- Added plugin base and loader for backend extensibility
- Implemented application settings management with config persistence
- Created Svelte-based frontend with Dashboard and Settings pages
- Added API routes for plugins, tasks, and settings
- Updated documentation and specifications
- Improved project structure and developer tools

superset_tool/__init__.py

@@ -1,14 +1,14 @@
-# [DEF:superset_tool:Module]
-# @SEMANTICS: package, root
-# @PURPOSE: Root package for superset_tool.
-# @LAYER: Domain
-# @PUBLIC_API: SupersetClient, SupersetConfig
-
-# [SECTION: IMPORTS]
-from .client import SupersetClient
-from .models import SupersetConfig
-# [/SECTION]
-
-__all__ = ["SupersetClient", "SupersetConfig"]
-
-# [/DEF:superset_tool]
+# [DEF:superset_tool:Module]
+# @SEMANTICS: package, root
+# @PURPOSE: Root package for superset_tool.
+# @LAYER: Domain
+# @PUBLIC_API: SupersetClient, SupersetConfig
+
+# [SECTION: IMPORTS]
+from .client import SupersetClient
+from .models import SupersetConfig
+# [/SECTION]
+
+__all__ = ["SupersetClient", "SupersetConfig"]
+
+# [/DEF:superset_tool]