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

backend/src/dependencies.py

@@ -1,24 +1,33 @@
-# [DEF:Dependencies:Module]
-# @SEMANTICS: dependency, injection, singleton, factory
-# @PURPOSE: Manages the creation and provision of shared application dependencies, such as the PluginLoader and TaskManager, to avoid circular imports.
-# @LAYER: Core
-# @RELATION: Used by the main app and API routers to get access to shared instances.
-
-from pathlib import Path
-from .core.plugin_loader import PluginLoader
-from .core.task_manager import TaskManager
-
-# Initialize singletons
-# Use absolute path relative to this file to ensure plugins are found regardless of CWD
-plugin_dir = Path(__file__).parent / "plugins"
-plugin_loader = PluginLoader(plugin_dir=str(plugin_dir))
-task_manager = TaskManager(plugin_loader)
-
-def get_plugin_loader() -> PluginLoader:
-    """Dependency injector for the PluginLoader."""
-    return plugin_loader
-
-def get_task_manager() -> TaskManager:
-    """Dependency injector for the TaskManager."""
-    return task_manager
+# [DEF:Dependencies:Module]
+# @SEMANTICS: dependency, injection, singleton, factory
+# @PURPOSE: Manages the creation and provision of shared application dependencies, such as the PluginLoader and TaskManager, to avoid circular imports.
+# @LAYER: Core
+# @RELATION: Used by the main app and API routers to get access to shared instances.
+
+from pathlib import Path
+from .core.plugin_loader import PluginLoader
+from .core.task_manager import TaskManager
+from .core.config_manager import ConfigManager
+
+# Initialize singletons
+# Use absolute path relative to this file to ensure plugins are found regardless of CWD
+project_root = Path(__file__).parent.parent.parent
+config_path = project_root / "config.json"
+config_manager = ConfigManager(config_path=str(config_path))
+
+def get_config_manager() -> ConfigManager:
+    """Dependency injector for the ConfigManager."""
+    return config_manager
+
+plugin_dir = Path(__file__).parent / "plugins"
+plugin_loader = PluginLoader(plugin_dir=str(plugin_dir))
+task_manager = TaskManager(plugin_loader)
+
+def get_plugin_loader() -> PluginLoader:
+    """Dependency injector for the PluginLoader."""
+    return plugin_loader
+
+def get_task_manager() -> TaskManager:
+    """Dependency injector for the TaskManager."""
+    return task_manager
 # [/DEF]