feat(waiter): Capacitor 8 Android project, native build mode, signed APK tooling

- capacitor.config.json: appId gr.bonamin.xenia, webDir dist-native,
  androidScheme http (origin http://localhost - no mixed-content block when
  calling venue servers over plain HTTP on the LAN)
- vite: `--mode native` builds to dist-native with the PWA plugin disabled
  (no service worker inside the app)
- Android: minSdk 24 / target 36; CAMERA permission for QR pairing;
  cleartext allowed via network_security_config (LAN IPs can't be listed
  per-domain); allowBackup=false so backups never carry login tokens
- Release signing reads ~/.xenia/keystore.properties (override with
  XENIA_KEYSTORE_PROPS) - the key never enters the repo; versionName 1.0.0 /
  versionCode 1 with a bump-both rule for sideloaded updates
- npm scripts build:native, apk:debug, apk:release (scripts/build-apk.mjs);
  APKs land in releases/ (gitignored); release APK is also copied to
  public/downloads/ so venue servers serve it at /downloads/xenia-waiter.apk
- waiter nginx: /downloads/ served as application/vnd.android.package-archive,
  real 404 when missing (never falls through to index.html)
- launcher icons + splash generated from the app icon (assets/ is the source)
- .gitattributes: gradlew LF, *.bat CRLF

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

waiter_pwa/vite.config.js

@@ -2,48 +2,59 @@ import { defineConfig } from 'vite'
 import react from '@vitejs/plugin-react'
 import { VitePWA } from 'vite-plugin-pwa'
 
-export default defineConfig({
-  server: {
-    host: '0.0.0.0',
-    port: 5173,
-    allowedHosts: ['all'],
-    proxy: {
-      '/api/ws': {
-        target: 'ws://localhost:8000',
-        ws: true,
-        changeOrigin: true,
-      },
-      '/api': {
-        target: 'http://localhost:8000',
-        changeOrigin: true,
+// `vite build --mode native` builds the UI bundled inside the Capacitor app:
+// no service worker (the app ships its own files) and a separate output dir so
+// it never mixes with the web build served by the venue's nginx.
+export default defineConfig(({ mode }) => {
+  const native = mode === 'native'
+
+  return {
+    build: {
+      outDir: native ? 'dist-native' : 'dist',
+    },
+    server: {
+      host: '0.0.0.0',
+      port: 5173,
+      allowedHosts: ['all'],
+      proxy: {
+        '/api/ws': {
+          target: 'ws://localhost:8000',
+          ws: true,
+          changeOrigin: true,
+        },
+        '/api': {
+          target: 'http://localhost:8000',
+          changeOrigin: true,
+        },
       },
     },
-  },
-  plugins: [
-    react(),
-    VitePWA({
-      registerType: 'prompt',
-      manifest: {
-        name: 'Xenia',
-        short_name: 'Xenia',
-        start_url: '/',
-        display: 'standalone',
-        background_color: '#0f172a',
-        theme_color: '#0f172a',
-        icons: [
-          { src: '/icons/icon-192.png', sizes: '192x192', type: 'image/png', purpose: 'any' },
-          { src: '/icons/icon-192.png', sizes: '192x192', type: 'image/png', purpose: 'maskable' },
-          { src: '/icons/icon-512.png', sizes: '512x512', type: 'image/png', purpose: 'any' },
-          { src: '/icons/icon-512.png', sizes: '512x512', type: 'image/png', purpose: 'maskable' },
-        ],
-      },
-      workbox: {
-        globPatterns: ['**/*.{js,css,html,ico,png,svg}'],
-        runtimeCaching: [],
-      },
-      devOptions: {
-        enabled: false,
-      },
-    }),
-  ],
+    plugins: [
+      react(),
+      VitePWA({
+        disable: native,
+        registerType: 'prompt',
+        manifest: {
+          name: 'Xenia',
+          short_name: 'Xenia',
+          start_url: '/',
+          display: 'standalone',
+          background_color: '#0f172a',
+          theme_color: '#0f172a',
+          icons: [
+            { src: '/icons/icon-192.png', sizes: '192x192', type: 'image/png', purpose: 'any' },
+            { src: '/icons/icon-192.png', sizes: '192x192', type: 'image/png', purpose: 'maskable' },
+            { src: '/icons/icon-512.png', sizes: '512x512', type: 'image/png', purpose: 'any' },
+            { src: '/icons/icon-512.png', sizes: '512x512', type: 'image/png', purpose: 'maskable' },
+          ],
+        },
+        workbox: {
+          globPatterns: ['**/*.{js,css,html,ico,png,svg}'],
+          runtimeCaching: [],
+        },
+        devOptions: {
+          enabled: false,
+        },
+      }),
+    ],
+  }
 })