fix(security): register SanitizeInput and CSRF middleware in app.module.ts

- Register SanitizeInputMiddleware for all routes to prevent stored XSS
- Register CsrfMiddleware for all routes (sets cookie on GET, validates on state-changing methods)
- Remove unsafe-inline from CSP scriptSrc directive
- AppModule now implements NestModule with configure() method

Co-Authored-By: Paperclip <noreply@paperclip.ing>

apps/api/src/app.module.ts

@@ -1,4 +1,4 @@
-import { Module } from '@nestjs/common';
+import { type MiddlewareConsumer, Module, type NestModule } from '@nestjs/common';
 import { APP_GUARD } from '@nestjs/core';
 import { CqrsModule } from '@nestjs/cqrs';
 import { ThrottlerModule } from '@nestjs/throttler';
@@ -13,6 +13,8 @@ import { PaymentsModule } from '@modules/payments';
 import { SearchModule } from '@modules/search';
 import { SharedModule } from '@modules/shared';
 import { ThrottlerBehindProxyGuard } from '@modules/shared/infrastructure/guards/throttler-behind-proxy.guard';
+import { CsrfMiddleware } from '@modules/shared/infrastructure/middleware/csrf.middleware';
+import { SanitizeInputMiddleware } from '@modules/shared/infrastructure/middleware/sanitize-input.middleware';
 import { SubscriptionsModule } from '@modules/subscriptions';
 import { AppController } from './app.controller';
 
@@ -62,4 +64,16 @@ import { AppController } from './app.controller';
     },
   ],
 })
-export class AppModule {}
+export class AppModule implements NestModule {
+  configure(consumer: MiddlewareConsumer): void {
+    // Sanitize all incoming request strings to prevent stored XSS
+    consumer
+      .apply(SanitizeInputMiddleware)
+      .forRoutes('*');
+
+    // CSRF double-submit cookie (sets on GET, validates on state-changing methods)
+    consumer
+      .apply(CsrfMiddleware)
+      .forRoutes('*');
+  }
+}

apps/api/src/main.ts

@@ -45,7 +45,7 @@ async function bootstrap() {
       contentSecurityPolicy: {
         directives: {
           defaultSrc: ["'self'"],
-          scriptSrc: ["'self'", "'unsafe-inline'"],
+          scriptSrc: ["'self'"],
           styleSrc: ["'self'", "'unsafe-inline'"],
           imgSrc: ["'self'", 'data:', 'https:', 'blob:'],
           connectSrc: ["'self'"],