Implement Standalone Android App via Flutter WebView

- Configured `vite.config.ts` for relative base path support.
- Initialized `mobile_app` Flutter project with `webview_flutter`.
- Added `assets/www` to Flutter assets configuration.
- Implemented `mobile_app/lib/main.dart` with WebView and Bridge API integration (Water Level Slider).
- Updated `.gitignore` for Flutter artifacts.
- Successfully built APK artifacts.

Co-authored-by: kliffdafunkfacekilla-arch <239708976+kliffdafunkfacekilla-arch@users.noreply.github.com>

mobile_app/assets/www/charges/lanceHead.svg

@@ -0,0 +1,9 @@
+<svg xmlns="http://www.w3.org/2000/svg" fill="#d7374a" stroke="#000" viewBox="50 50 200 200">
+<metadata source="https://commons.wikimedia.org/wiki/File:Meuble_h%C3%A9raldique_Fer_de_lance.svg" author="Orror" license="https://www.gnu.org/licenses/fdl-1.3.html"/>
+  <g id="lanceHead" stroke-width=".5" transform="matrix(0.9,0,0,0.9,-4.7,-15.1)">
+    <path d="M116.25 84.13v.59L98.5 140.56s4.21 0 8.13 3.9c3.9 3.92 4.25 8.16 4.25 8.16h10.93s.3-4.24 4.22-8.15c3.91-3.91 8.16-3.9 8.16-3.9l-17.75-55.85v-.6l-.1.29-.09-.28z"/>
+    <path d="M116.42 100.12v52.5"/>
+    <rect width="15.6" height="3.3" x="108.6" y="152.6" ry="1.7"/>
+    <path d="M111.22 155.88l-1.97 15.65h14.5l-1.94-15.5-10.6-.16z"/>
+  </g>
+</svg>