Add initial project structure with backend and frontend setup

- Created backend structure with Go, including main application logic and API endpoints.
- Added Docker support for both development and production environments.
- Introduced frontend using Nuxt 3 with Tailwind CSS for styling.
- Included configuration files for Docker and environment variables.
- Established basic documentation for contributing, development, and deployment processes.
- Set up .gitignore and .dockerignore files to manage ignored files in the repository.

frontend-nuxt/assets/css/leaflet-overrides.css

@@ -0,0 +1,10 @@
+/* Map container background from theme (DaisyUI base-200) */
+.leaflet-container {
+  background: hsl(var(--b2));
+}
+
+/* Override Leaflet default: show tiles even when leaflet-tile-loaded is not applied
+   (e.g. due to cache, Nuxt hydration, or load event order). */
+.leaflet-tile {
+  visibility: visible !important;
+}