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/resources/README.md

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+# App icon & splash source images
+
+`@capacitor/assets` generates every Android (and iOS) icon/splash density from these masters.
+
+| File | Size | Purpose |
+|------|------|---------|
+| `icon.png` | 1024×1024 | App icon (all densities + Android adaptive icon) |
+| `splash.png` | 2732×2732 | Launch splash (light) |
+| `splash-dark.png` | 2732×2732 | Launch splash (dark mode) |
+
+These were generated from the existing PWA icon (`server/public/icon-512.png`) + brand blue
+`#1F3B73`. To rebrand, replace these three files (keep the sizes) and re-run:
+
+```bash
+cd mobile
+npm run assets        # Android only  (npm run assets:all for iOS too)
+npx cap sync
+```
+
+Tip: for the sharpest result, drop a true 1024×1024 `icon.png` (and a 2732×2732 `splash.png`)
+exported from the design source rather than an upscale.

mobile/resources/android-permissions.xml

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+<!-- Paste these into mobile/android/app/src/main/AndroidManifest.xml, inside <manifest> and
+     directly above the <application> element. INTERNET is already added by Capacitor.
+     See ANDROID_SETUP.md §3. -->
+
+<!-- Push notifications: Android 13 (API 33)+ shows a runtime prompt -->
+<uses-permission android:name="android.permission.POST_NOTIFICATIONS" />
+
+<!-- Voice / video calls + camera, used by the WebRTC features in the web UI -->
+<uses-permission android:name="android.permission.CAMERA" />
+<uses-permission android:name="android.permission.RECORD_AUDIO" />
+<uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS" />
+
+<!-- Camera is optional hardware (tablets without one can still install) -->
+<uses-feature android:name="android.hardware.camera" android:required="false" />
+
+<!-- Later, for screen-sharing FROM the phone (needs a screen-capture plugin):
+<uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
+<uses-permission android:name="android.permission.FOREGROUND_SERVICE_MEDIA_PROJECTION" />
+-->