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/gradle-mirror.init.gradle.example

@@ -0,0 +1,42 @@
+// Route Gradle (Android Gradle Plugin + deps) through a Maven mirror — for
+// networks where dl.google.com / repo.maven.apache.org are blocked (Iran).
+//
+//   1) copy this file to:  android/gradle-mirror.init.gradle
+//   2) set MIRROR (and GOOGLE if your Nexus exposes Google's repo separately)
+//   3) build:  gradlew.bat assembleDebug --init-script gradle-mirror.init.gradle
+
+// A Nexus "maven group" that proxies Maven Central AND Google's android repo:
+def MIRROR = "https://mirror.soroushasadi.com/repository/maven-public/"
+// If Google's repo is a separate proxy, set it here (else leave = MIRROR):
+def GOOGLE = MIRROR
+
+settingsEvaluated { settings ->
+  settings.pluginManagement {
+    repositories {
+      maven { url GOOGLE }
+      maven { url MIRROR }
+    }
+  }
+  try {
+    settings.dependencyResolutionManagement {
+      repositoriesMode.set(RepositoriesMode.PREFER_SETTINGS)
+      repositories {
+        maven { url GOOGLE }
+        maven { url MIRROR }
+      }
+    }
+  } catch (ignored) { }
+}
+
+allprojects {
+  buildscript {
+    repositories {
+      maven { url GOOGLE }
+      maven { url MIRROR }
+    }
+  }
+  repositories {
+    maven { url GOOGLE }
+    maven { url MIRROR }
+  }
+}