chore: add project scaffolding and resources

This initial commit scaffolds the project with essential docs, assets, and build configs.
It adds Android icons, design assets, and release metadata to support mobile targets.
A fastlane config and F-Droid manifest are included to streamline builds.

- Adds F-Droid configuration for automated builds
- Includes license and privacy policy documents
- Provides app icons and assets for Android and design system

design/icon-proposals/04-orbit-gallery.svg

@@ -0,0 +1,11 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512">
+  <rect width="512" height="512" rx="116" fill="#0b5430"/>
+  <circle cx="256" cy="256" r="166" fill="none" stroke="#80b688" stroke-width="22" stroke-dasharray="250 70" stroke-linecap="round"/>
+  <path d="m390 136 25 4-13 22Z" fill="#80b688"/>
+  <path d="m116 362-24-7 16-20Z" fill="#80b688"/>
+  <g transform="rotate(7 256 256)">
+    <rect x="165" y="111" width="182" height="290" rx="42" fill="#f8faf4"/>
+    <circle cx="296" cy="179" r="24" fill="#f2c85b"/>
+    <path d="m181 326 56-76 42 50 26-30 27 36v58c0 12-10 21-21 21H202c-12 0-21-10-21-21Z" fill="#16804a"/>
+  </g>
+</svg>