Implement Mihomo external-controller support in configuration and gateway

- Added optional Mihomo configuration fields in `config.compose.yaml` and `config.example.yaml` for enhanced integration with the Mihomo external-controller.
- Updated the `Gateway` to handle Mihomo API requests, including proxying and error handling for Mihomo-specific endpoints.
- Enhanced the documentation in `GATEWAY_RUN.md` to guide users on configuring Mihomo integration.
- Introduced new utility functions in the web client for interacting with Mihomo API endpoints, improving the overall user experience.
- Updated the sidebar in the Svelte components to include a link to the Mihomo section, enhancing navigation.

web/package.json

@@ -32,6 +32,7 @@
 	"dependencies": {
 		"@types/leaflet": "^1.9.21",
 		"bits-ui": "^2.16.4",
+		"chart.js": "^4.5.1",
 		"clsx": "^2.1.1",
 		"leaflet": "^1.9.4",
 		"tailwind-merge": "^3.5.0",