feat: add REST API server with download management

Very early dev work, more changes will be active in this branch.

- Implement download queue management and worker system
- Add OpenAPI/Swagger documentation
- Include download progress tracking and status endpoints
- Add API authentication and error handling
- Update core components to support API integration

pyproject.toml

@@ -58,6 +58,7 @@ dependencies = [
     "httpx>=0.28.1,<0.29",
     "cryptography>=45.0.0",
     "subby",
+    "aiohttp-swagger3>=0.9.0,<1",
 ]
 
 [project.urls]