feat: implement unified researcher search and enhance dashboard functionality

- Updated the API service to include a new `searchResearcher` function for streamlined researcher data retrieval.
- Modified `LandingPage` to utilize the new search functionality, reducing the number of API calls.
- Refactored `DashboardPage` to handle the new data structure returned from the search, improving loading efficiency and user experience.
- Enhanced `vite.config.js` and `.env.example` for better API integration and development setup.
- Added health checks in `docker-compose.yml` for database and Redis services to ensure service reliability.

frontend/vite.config.js

@@ -13,7 +13,10 @@ export default defineConfig(({ mode }) => {
       host: true,
       port: 5173,
       proxy: {
-        '/researchers': {
+        // El backend agrupa todo bajo /api (researchers, export, …).
+        // Con un único prefijo evitamos tener que mantener una entrada
+        // por router cada vez que se añada un endpoint nuevo.
+        '/api': {
           target: proxyTarget,
           changeOrigin: true,
         },