feat(frontend): scaffold Vue 3 + Vite + Tailwind Gruvbox

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/vite.config.ts

@@ -0,0 +1,16 @@
+import { defineConfig } from 'vite'
+import vue from '@vitejs/plugin-vue'
+import { fileURLToPath, URL } from 'node:url'
+
+export default defineConfig({
+  plugins: [vue()],
+  resolve: {
+    alias: { '@': fileURLToPath(new URL('./src', import.meta.url)) },
+  },
+  server: {
+    proxy: {
+      '/api': 'http://localhost:8000',
+      '/uploads': 'http://localhost:8000',
+    },
+  },
+})