chore: initial project setup with backend, frontend, and infrastructure

Add complete NexaPantry application structure including:
- Docker Compose configuration with PostgreSQL, Redis, FastAPI backend, worker, frontend and Caddy
- Environment configuration template with database, auth, and service settings
- GitHub Actions CI workflow for backend/frontend linting, testing, auditing and Docker builds
- AGPL-3.0 license and comprehensive README with setup, development, and security documentation
- Backend

frontend/vite.config.ts

@@ -0,0 +1,46 @@
+import react from '@vitejs/plugin-react';
+import { defineConfig } from 'vitest/config';
+import { VitePWA } from 'vite-plugin-pwa';
+
+export default defineConfig({
+  plugins: [
+    react(),
+    VitePWA({
+      registerType: 'autoUpdate',
+      manifest: {
+        name: 'NexaPantry',
+        short_name: 'NexaPantry',
+        description: 'Self-hosted pantry management for homes and shared households.',
+        theme_color: '#0f766e',
+        background_color: '#f8fafc',
+        display: 'standalone',
+        scope: '/',
+        start_url: '/',
+        icons: [
+          { src: '/icons/icon.svg', sizes: 'any', type: 'image/svg+xml', purpose: 'any maskable' }
+        ]
+      },
+      workbox: {
+        navigateFallback: '/index.html',
+        globPatterns: ['**/*.{js,css,html,svg,png,woff2}'],
+        runtimeCaching: [
+          {
+            urlPattern: ({ url }) => url.pathname.startsWith('/api/'),
+            handler: 'NetworkFirst',
+            options: { cacheName: 'nexapantry-api', networkTimeoutSeconds: 3 }
+          }
+        ]
+      }
+    })
+  ],
+  server: {
+    proxy: {
+      '/api': 'http://127.0.0.1:8000'
+    }
+  },
+  test: {
+    environment: 'jsdom',
+    globals: true,
+    setupFiles: './src/test-setup.ts'
+  }
+});