feat(tauri): add Tauri v2 Android app wrapper

- Wrap apps/web as Android APK via Tauri v2 WebView (zero web changes)
- Disable default compression feature to avoid brotli/alloc-no-stdlib conflict with Rust 1.96
- Add RGBA icon placeholders
- Add Android keystore to gitignore

APK output: apps/tauri/gen/android/app/build/outputs/apk/

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

apps/tauri/package.json

@@ -0,0 +1,16 @@
+{
+  "name": "@zeavis/tauri",
+  "version": "0.1.0",
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "dev": "tauri dev",
+    "build": "tauri build",
+    "android": "tauri android dev",
+    "android:build": "tauri android build",
+    "tauri": "tauri"
+  },
+  "devDependencies": {
+    "@tauri-apps/cli": "^2"
+  }
+}