Add Capacitor Android packaging (APK) for Cafe Bazaar / Myket

- Next static export (output: export) wrapped by Capacitor; appId
  com.bargevasat.app, appName «برگ وسط»
- android/ native project + @capacitor/app; hardware back handled by
  CapacitorBack (back a screen, exit at home)
- npm scripts (cap:sync, android:open, android:apk), ANDROID.md
- Gradle Maven-mirror init-script template (dl.google.com/Maven Central are
  blocked in Iran — same reason NuGet is mirrored)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

ANDROID.md

@@ -0,0 +1,45 @@
+# برگ وسط — Android (Capacitor) build
+
+The app is packaged with **Capacitor** for Cafe Bazaar / Myket.
+
+## Layout
+- `next.config.ts` → `output: "export"` (static site in `out/`)
+- `capacitor.config.ts` → appId `com.bargevasat.app`, appName «برگ وسط», webDir `out`
+- `android/` → generated native project (committed; build outputs are git-ignored)
+- Hardware **back button** handled by `src/components/CapacitorBack.tsx` (`@capacitor/app`)
+
+## Build the web + sync native
+```bash
+npm run cap:sync          # next build (export) + cap sync android
+```
+
+## Build the APK
+```bash
+npm run android:apk       # → android/app/build/outputs/apk/debug/app-debug.apk
+# or open in Android Studio:
+npm run android:open
+```
+
+> Point the app at the live server at build time:
+> `NEXT_PUBLIC_USE_SERVER=1 NEXT_PUBLIC_SERVER_URL=https://api.example.com npm run cap:sync`
+
+## ⚠️ Maven mirror required (Iran)
+
+Gradle pulls the Android Gradle Plugin from **dl.google.com** and **Maven Central**,
+which are blocked in Iran — exactly like nuget.org. Provide a Maven/Gradle mirror
+(your Nexus `maven-public` group that proxies Maven Central **and** Google's
+android repo), then build with the init script:
+
+```bash
+cd android
+gradlew.bat assembleDebug --init-script gradle-mirror.init.gradle
+```
+
+Copy `android/gradle-mirror.init.gradle.example` → `android/gradle-mirror.init.gradle`
+and set your mirror URL(s). (Kept out of git; machine-specific.)
+
+## Release (Cafe Bazaar / Myket)
+1. Generate a keystore: `keytool -genkey -v -keystore bargevasat.keystore -alias bargevasat -keyalg RSA -keysize 2048 -validity 10000`
+2. Configure signing in `android/app/build.gradle` (release `signingConfig`).
+3. `gradlew.bat assembleRelease` (or `bundleRelease` for AAB) → upload to Cafe Bazaar / Myket.
+4. App icon/splash: replace `android/app/src/main/res/**` (use `@capacitor/assets` to generate).