feat(app): enable trust proxy and update app initialization

- Activated `trust proxy` setting to retrieve real IP behind reverse proxies.
- Updated app initialization to use `NestExpressApplication`.

backend/src/main.ts

@@ -1,6 +1,7 @@
 import { Logger, ValidationPipe } from "@nestjs/common";
 import { ConfigService } from "@nestjs/config";
 import { NestFactory } from "@nestjs/core";
+import { NestExpressApplication } from "@nestjs/platform-express";
 import * as Sentry from "@sentry/nestjs";
 import { nodeProfilingIntegration } from "@sentry/profiling-node";
 import helmet from "helmet";
@@ -8,10 +9,13 @@ import { AppModule } from "./app.module";
 import { AllExceptionsFilter } from "./common/filters/http-exception.filter";
 
 async function bootstrap() {
-	const app = await NestFactory.create(AppModule);
+	const app = await NestFactory.create<NestExpressApplication>(AppModule);
 	const configService = app.get(ConfigService);
 	const logger = new Logger("Bootstrap");
 
+	// Activer trust proxy pour récupérer l'IP réelle derrière un reverse proxy
+	app.set("trust proxy", true);
+
 	const sentryDsn = configService.get<string>("SENTRY_DSN");
 	if (sentryDsn) {
 		Sentry.init({