refactor(config): use Vite proxy for API requests and change backend port

- Configure Vite dev server to proxy /v1 requests to backend
- Change backend port from 8000 to 8001
- Simplify API URLs to relative paths instead of absolute localhost URLs
- Increase debounce delay from 500ms to 1000ms for better stability
- Update README documentation to reflect all changes

vite.config.js

@@ -5,7 +5,13 @@ export default defineConfig({
   plugins: [vue()],
   server: {
     host: true,
-    port: 5173
+    port: 5173,
+    proxy: {
+      '/v1': {
+        target: 'http://localhost:8001',
+        changeOrigin: true
+      }
+    }
   },
   build: {
     rollupOptions: {