feat(auth): implement user authentication with JWT and NextAuth

- Added user registration and login functionality with JWT authentication.
- Created auth controller, service, and module in the backend.
- Implemented user model and user products management.
- Integrated NextAuth for session management on the frontend.
- Added middleware for protecting routes and handling public access.
- Updated frontend API routes to include authorization headers.
- Enhanced recipe and user product models to support ownership and visibility.
- Created registration and login pages in the frontend.
- Added necessary types for NextAuth session management.

backend/src/app.module.ts

@@ -1,4 +1,5 @@
 import { Module } from '@nestjs/common';
+import { APP_GUARD } from '@nestjs/core';
 import { HealthModule } from './health/health.module';
 import { PrismaModule } from './prisma/prisma.module';
 import { ProductsModule } from './products/products.module';
@@ -9,6 +10,10 @@ import { PantryModule } from './pantry/pantry.module';
 import { MealPlanModule } from './meal-plan/meal-plan.module';
 import { ReceiptImportModule } from './receipt-import/receipt-import.module';
 import { ReceiptAliasModule } from './receipt-alias/receipt-alias.module';
+import { AuthModule } from './auth/auth.module';
+import { UsersModule } from './users/users.module';
+import { UserProductsModule } from './user-products/user-products.module';
+import { JwtAuthGuard } from './auth/jwt-auth.guard';
 
 
 @Module({
@@ -23,6 +28,15 @@ import { ReceiptAliasModule } from './receipt-alias/receipt-alias.module';
     MealPlanModule,
     ReceiptImportModule,
     ReceiptAliasModule,
+    AuthModule,
+    UsersModule,
+    UserProductsModule,
+  ],
+  providers: [
+    {
+      provide: APP_GUARD,
+      useClass: JwtAuthGuard,
+    },
   ],
 })
 export class AppModule {}