feat(mobile): Android prep — icons/splash assets, permissions, FCM setup

- resources/: 1024 icon.png + 2732 splash.png/splash-dark.png generated from the
  PWA icon + brand blue; wired @capacitor/assets (npm run assets) + splash-screen plugin.
- ANDROID_SETUP.md: end-to-end guide (SDK setup, cap add android, manifest permissions,
  Firebase/google-services.json + Gradle, run, Play AAB build) for package com.bizgaze.connect.
- android-permissions.xml: paste-ready POST_NOTIFICATIONS + camera/mic/WebRTC perms.
- mobile/README links the guide; setup adds `npm run assets`.

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

mobile/package.json

@@ -4,6 +4,8 @@
   "description": "Biz Connect mobile app — Capacitor shell loading the Connect web UI",
   "scripts": {
     "sync": "cap sync",
+    "assets": "capacitor-assets generate --android",
+    "assets:all": "capacitor-assets generate",
     "android": "cap open android",
     "ios": "cap open ios"
   },
@@ -14,9 +16,11 @@
     "@capacitor/core": "^6.1.0",
     "@capacitor/ios": "^6.1.0",
     "@capacitor/push-notifications": "^6.0.0",
+    "@capacitor/splash-screen": "^6.0.0",
     "@capacitor/status-bar": "^6.0.0"
   },
   "devDependencies": {
+    "@capacitor/assets": "^3.0.5",
     "@capacitor/cli": "^6.1.0"
   }
 }