feat: add course catalog, enrollment, progress tracking, quizzes, and reviews

Backend changes:
- Add Enrollment and LessonProgress models to track user progress
- Add UserRole enum (USER, MODERATOR, ADMIN)
- Add course verification and moderation fields
- New CatalogModule: public course browsing, publishing, verification
- New EnrollmentModule: enroll, progress tracking, quiz submission, reviews
- Add quiz generation endpoint to LessonsController

Frontend changes:
- Redesign course viewer: proper course UI with lesson navigation, progress bar
- Add beautiful typography styles for course content (prose-course)
- Fix first-login bug with token exchange retry logic
- New pages: /catalog (public courses), /catalog/[id] (course details), /learning (enrollments)
- Add LessonQuiz component with scoring and results
- Update sidebar navigation: add Catalog and My Learning links
- Add publish/verify buttons in course editor
- Integrate enrollment progress tracking with backend

All courses now support: sequential progression, quiz tests, reviews, ratings,
author verification badges, and full marketplace publishing workflow.

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/api/src/enrollment/enrollment.controller.ts

@@ -0,0 +1,84 @@
+import {
+  Controller,
+  Post,
+  Get,
+  Param,
+  Body,
+  Query,
+  HttpCode,
+  HttpStatus,
+} from '@nestjs/common';
+import { ApiTags, ApiOperation, ApiBearerAuth } from '@nestjs/swagger';
+import { EnrollmentService } from './enrollment.service';
+import { CurrentUser } from '../auth/decorators/current-user.decorator';
+import { User } from '@coursecraft/database';
+
+@ApiTags('enrollment')
+@Controller('enrollment')
+@ApiBearerAuth()
+export class EnrollmentController {
+  constructor(private enrollmentService: EnrollmentService) {}
+
+  @Post(':courseId/enroll')
+  @HttpCode(HttpStatus.CREATED)
+  @ApiOperation({ summary: 'Enroll in a course' })
+  async enroll(@Param('courseId') courseId: string, @CurrentUser() user: User): Promise<any> {
+    return this.enrollmentService.enroll(user.id, courseId);
+  }
+
+  @Get()
+  @ApiOperation({ summary: 'Get my enrolled courses' })
+  async myEnrollments(@CurrentUser() user: User): Promise<any> {
+    return this.enrollmentService.getUserEnrollments(user.id);
+  }
+
+  @Get(':courseId/progress')
+  @ApiOperation({ summary: 'Get my progress for a course' })
+  async getProgress(@Param('courseId') courseId: string, @CurrentUser() user: User): Promise<any> {
+    return this.enrollmentService.getProgress(user.id, courseId);
+  }
+
+  @Post(':courseId/lessons/:lessonId/complete')
+  @HttpCode(HttpStatus.OK)
+  @ApiOperation({ summary: 'Mark a lesson as completed' })
+  async completeLesson(
+    @Param('courseId') courseId: string,
+    @Param('lessonId') lessonId: string,
+    @CurrentUser() user: User,
+  ): Promise<any> {
+    return this.enrollmentService.completeLesson(user.id, courseId, lessonId);
+  }
+
+  @Post(':courseId/lessons/:lessonId/quiz')
+  @HttpCode(HttpStatus.OK)
+  @ApiOperation({ summary: 'Submit quiz score' })
+  async submitQuiz(
+    @Param('courseId') courseId: string,
+    @Param('lessonId') lessonId: string,
+    @Body('score') score: number,
+    @CurrentUser() user: User,
+  ): Promise<any> {
+    return this.enrollmentService.saveQuizScore(user.id, courseId, lessonId, score);
+  }
+
+  @Post(':courseId/review')
+  @HttpCode(HttpStatus.CREATED)
+  @ApiOperation({ summary: 'Leave a review' })
+  async createReview(
+    @Param('courseId') courseId: string,
+    @Body() body: { rating: number; title?: string; content?: string },
+    @CurrentUser() user: User,
+  ): Promise<any> {
+    return this.enrollmentService.createReview(user.id, courseId, body.rating, body.title, body.content);
+  }
+
+  @Get(':courseId/reviews')
+  @ApiOperation({ summary: 'Get course reviews' })
+  async getReviews(
+    @Param('courseId') courseId: string,
+    @Query('page') page?: number,
+    @Query('limit') limit?: number,
+  ): Promise<any> {
+    return this.enrollmentService.getCourseReviews(courseId, page, limit);
+  }
+}