feat(android): add Capacitor setup for Android APK builds

- Migrate web assets from root to www/ directory
- Add Android native project with Capacitor 8
- Add GitHub Actions workflow for automated APK builds
- Configure app identity and splash screens

www/manifest.webmanifest

@@ -0,0 +1,21 @@
+{
+  "name": "Juego del Impostor",
+  "short_name": "Impostor",
+  "description": "Un juego de deducción social para descubrir quién es el impostor",
+  "start_url": "/",
+  "display": "standalone",
+  "background_color": "#0a0a0a",
+  "theme_color": "#ff4444",
+  "orientation": "portrait",
+  "icons": [
+    {
+      "src": "logo.png",
+      "sizes": "192x192",
+      "type": "image/png",
+      "purpose": "any maskable"
+    }
+  ],
+  "categories": ["games", "entertainment"],
+  "lang": "es",
+  "dir": "ltr"
+}