chore(dev): move local API default port to 3010

Avoid conflict with another local service on 3000; align Vite proxies and docs.

apps/admin-web/vite.config.ts

@@ -1,10 +1,12 @@
 import { defineConfig } from 'vite';
 import react from '@vitejs/plugin-react';
 
+const apiTarget = process.env.VITE_API_TARGET ?? 'http://localhost:3010';
+
 export default defineConfig({
   plugins: [react()],
   server: {
     port: 5175,
-    proxy: { '/api': 'http://localhost:3000' },
+    proxy: { '/api': apiTarget },
   },
 });