Enhance configuration and logging for user management commands

- Updated `.env.example` to include new settings for trusted proxies and networks for better security with X-Forwarded headers.
- Modified `BlockUserCommandHandler` and `UnblockUserCommandHandler` to include logging for gateway update failures, ensuring better traceability of issues during user blocking/unblocking.
- Adjusted tests for command handlers to incorporate logging functionality, improving test coverage and reliability.
- Updated frontend configuration to dynamically set the server port based on environment variables.

frontend/vite.config.ts

@@ -18,6 +18,7 @@ export default defineConfig({
     alias: { '@': path.resolve(__dirname, './src') },
   },
   server: {
+    port: process.env.PORT ? Number(process.env.PORT) : 5173,
     proxy: {
       '/api': { target: apiTarget, changeOrigin: true },
       '/hubs': { target: apiTarget, changeOrigin: true, ws: true },