refactor(structure): reorganize app layout

BREAKING CHANGE: root backend/frontend directories and old run/manage entrypoints were removed. Use apps/backend, apps/frontend, and python main.py commands instead.

apps/frontend/vite.config.js

@@ -0,0 +1,45 @@
+import { defineConfig } from 'vite';
+import vue from '@vitejs/plugin-vue';
+import path from 'path';
+
+// https://vite.dev/config/
+export default defineConfig({
+  plugins: [vue()],
+
+  resolve: {
+    alias: {
+      '@': path.resolve(__dirname, './src'),
+    },
+  },
+
+  server: {
+    host: '0.0.0.0', // Listen on all network interfaces for LAN access
+    port: 3000,
+    proxy: {
+      '/api': {
+        target: 'http://localhost:8000',
+        changeOrigin: true,
+      },
+    },
+  },
+
+  build: {
+    outDir: 'dist',
+    sourcemap: false,
+    rollupOptions: {
+      output: {
+        manualChunks(id) {
+          // Manual chunking for better dependency management
+          if (id.includes('node_modules')) {
+            // Ant Design Vue
+            if (id.includes('ant-design-vue')) {
+              return 'ant-design-vue';
+            }
+            // Group all other vendor code together
+            return 'vendor';
+          }
+        },
+      },
+    },
+  },
+});