feat: add Vue.js WebUI — YesPlayMusic-inspired SPA with all pages and components

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

web/vite.config.ts

@@ -0,0 +1,19 @@
+import { defineConfig } from 'vite';
+import vue from '@vitejs/plugin-vue';
+
+export default defineConfig({
+  plugins: [vue()],
+  server: {
+    port: 5173,
+    proxy: {
+      '/api': 'http://localhost:3000',
+      '/ws': {
+        target: 'ws://localhost:3000',
+        ws: true,
+      },
+    },
+  },
+  build: {
+    outDir: 'dist',
+  },
+});