fix(dev): vite proxy → port 3090

The TKB server runs on 3090; the proxy was still pointed at 3080 from the
METRO project origin, so the dev server returned the wrong schema (stations
instead of people).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

web/vite.config.ts

@@ -6,7 +6,7 @@ export default defineConfig({
   plugins: [react(), tailwindcss()],
   server: {
     proxy: {
-      '/api': 'http://localhost:3080',
+      '/api': 'http://localhost:3090',
     },
   },
 })