feat(profile): add user profile management with first and last name fields

backend/src/users/users.controller.ts

@@ -0,0 +1,52 @@
+import { Controller, Get, Patch, Body } from '@nestjs/common';
+import { IsEmail, IsOptional, IsString, MaxLength } from 'class-validator';
+import { UsersService } from './users.service';
+import { CurrentUser } from '../auth/decorators/current-user.decorator';
+
+class UpdateProfileDto {
+  @IsOptional()
+  @IsString()
+  @MaxLength(100)
+  firstName?: string;
+
+  @IsOptional()
+  @IsString()
+  @MaxLength(100)
+  lastName?: string;
+
+  @IsOptional()
+  @IsEmail()
+  email?: string;
+}
+
+@Controller('api/users')
+export class UsersController {
+  constructor(private readonly usersService: UsersService) {}
+
+  @Get('me')
+  async getMe(@CurrentUser() user: { userId: number; username: string }) {
+    const found = await this.usersService.findById(user.userId);
+    return {
+      id: found?.id,
+      username: found?.username,
+      email: found?.email,
+      firstName: found?.firstName,
+      lastName: found?.lastName,
+    };
+  }
+
+  @Patch('me')
+  async updateMe(
+    @CurrentUser() user: { userId: number; username: string },
+    @Body() dto: UpdateProfileDto,
+  ) {
+    const updated = await this.usersService.updateProfile(user.userId, dto);
+    return {
+      id: updated.id,
+      username: updated.username,
+      email: updated.email,
+      firstName: updated.firstName,
+      lastName: updated.lastName,
+    };
+  }
+}

backend/src/users/users.module.ts

@@ -1,10 +1,12 @@
 import { Module } from '@nestjs/common';
 import { UsersService } from './users.service';
+import { UsersController } from './users.controller';
 import { PrismaModule } from '../prisma/prisma.module';
 
 @Module({
   imports: [PrismaModule],
   providers: [UsersService],
+  controllers: [UsersController],
   exports: [UsersService],
 })
 export class UsersModule {}

backend/src/users/users.service.ts

@@ -16,4 +16,8 @@ export class UsersService {
   create(data: { username: string; email: string; passwordHash: string }) {
     return this.prisma.user.create({ data });
   }
+
+  updateProfile(id: number, data: { firstName?: string; lastName?: string; email?: string }) {
+    return this.prisma.user.update({ where: { id }, data });
+  }
 }