Add Checkpoints feature with routes, template, and JavaScript integration

- Introduced CheckpointsRoutes for managing checkpoints-related endpoints and handling the checkpoints page.
- Added checkpoints.html template for rendering the checkpoints interface with a work-in-progress message.
- Implemented checkpoints.js to manage the initialization of the Checkpoints page and its components.
- Updated LoraManager to include checkpoints routes in the application setup, enhancing overall functionality.

py/lora_manager.py

@@ -5,6 +5,7 @@ from .config import config
 from .routes.lora_routes import LoraRoutes
 from .routes.api_routes import ApiRoutes
 from .routes.recipe_routes import RecipeRoutes
+from .routes.checkpoints_routes import CheckpointsRoutes
 from .services.lora_scanner import LoraScanner
 from .services.recipe_scanner import RecipeScanner
 from .services.file_monitor import LoraFileMonitor
@@ -59,12 +60,14 @@ class LoraManager:
         
         # Setup feature routes
         routes = LoraRoutes()
+        checkpoints_routes = CheckpointsRoutes()
         
         # Setup file monitoring
         monitor = LoraFileMonitor(routes.scanner, config.loras_roots)
         monitor.start()
         
         routes.setup_routes(app)
+        checkpoints_routes.setup_routes(app)
         ApiRoutes.setup_routes(app, monitor)
         RecipeRoutes.setup_routes(app)
         
@@ -130,4 +133,4 @@ class LoraManager:
     async def _cleanup(cls, app):
         """Cleanup resources"""
         if 'lora_monitor' in app:
-            app['lora_monitor'].stop()
+            app['lora_monitor'].stop()