Update project documentation and improve frontend functionality

- Updated the backend documentation in CONTRIBUTING.md and README.md to reflect changes in application structure and API endpoints.
- Enhanced the frontend components in MapView.vue for better handling of context menu actions.
- Added new types and interfaces in TypeScript for improved type safety in the frontend.
- Introduced new utility classes for managing characters and markers in the map.
- Updated .gitignore to include .vscode directory for better development environment management.

frontend-nuxt/package.json

@@ -19,6 +19,7 @@
   },
   "devDependencies": {
     "@nuxtjs/tailwindcss": "^6.12.2",
+    "@types/leaflet": "^1.9.21",
     "daisyui": "^3.9.4",
     "tailwindcss": "^3.4.17",
     "typescript": "^5.6.3"