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/.dockerignore

@@ -0,0 +1,31 @@
+# No copiar artefactos del host al contenedor.
+#
+# El error "sh: vite: not found" al hacer `docker compose up` aparece
+# cuando los node_modules del host (Windows / macOS) sobrescriben los
+# que `npm install` acaba de instalar dentro del contenedor Linux.
+# Excluyéndolos aquí, el `COPY . .` del Dockerfile no los pisa.
+node_modules/
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*
+
+# Builds locales / cachés.
+dist/
+build/
+.vite/
+*.timestamp-*
+
+# Secretos: docker-compose ya inyecta las variables vía `env_file`,
+# no necesitamos copiarlos al filesystem de la imagen.
+.env
+.env.*
+!.env.example
+
+# Editor / OS.
+.git/
+.gitignore
+.DS_Store
+Thumbs.db
+.idea/
+.vscode/