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/app.module.ts

@@ -5,6 +5,8 @@ import { join } from 'path';
 import { AuthModule } from './auth/auth.module';
 import { UsersModule } from './users/users.module';
 import { CoursesModule } from './courses/courses.module';
+import { CatalogModule } from './catalog/catalog.module';
+import { EnrollmentModule } from './enrollment/enrollment.module';
 import { GenerationModule } from './generation/generation.module';
 import { PaymentsModule } from './payments/payments.module';
 import { SearchModule } from './search/search.module';
@@ -38,6 +40,8 @@ import { PrismaModule } from './common/prisma/prisma.module';
     AuthModule,
     UsersModule,
     CoursesModule,
+    CatalogModule,
+    EnrollmentModule,
     GenerationModule,
     PaymentsModule,
     SearchModule,