Refactor core services and components to prevent runtime errors on web platforms and optimize build environment.
- Update `Dockerfile.web` to use Node 25 for the build stage.
- Implement lazy loading for `expo-media-library` and `expo-file-system` in `ImageGallery` to prevent crashes on web where these native modules are unavailable.
- Refactor `CallKeepServiceImpl` to use dynamic imports for `expo-callkit-telecom`, ensuring the service remains compatible with web environments.
Add nginx.conf to serve the Expo web build and update Dockerfile.web to copy the configuration into the nginx container. This enables proper static file serving with appropriate MIME types and default caching headers for the production web deployment.
