feat(desktop): start API and Vite dev servers with proxies

- Start API server on port 3001 and Vite dev server on port 5173 in the desktop dev flow
- Proxy /auth, /health, and /api to the local API server for development
- Gracefully handle startup/shutdown and report failures clearly

packages/web/vite.config.ts

@@ -56,6 +56,14 @@ export default defineConfig({
   server: {
     port: 5173,
     proxy: {
+      '/auth': {
+        target: `http://127.0.0.1:${process.env.OPENCHAMBER_PORT || 3001}`,
+        changeOrigin: true,
+      },
+      '/health': {
+        target: `http://127.0.0.1:${process.env.OPENCHAMBER_PORT || 3001}`,
+        changeOrigin: true,
+      },
       '/api': {
         target: `http://127.0.0.1:${process.env.OPENCHAMBER_PORT || 3001}`,
         changeOrigin: true,