Summary

• Adds EducatorModule with full course/section/content CRUD, class management, enrollment, analytics, and deadlines in backend/src/modules/educator/
• Extends Role enum with STUDENT and EDUCATOR roles; educator-only endpoints protected via @Roles(Role.EDUCATOR, Role.ADMIN)
• Students enroll in classes via unique 8-character enrollment codes
• Class analytics include per-section average scores, completion rates, and at-risk student detection (below 60% threshold)
• Auto-migrating tables: courses, course_sections, section_content, classes, class_enrollments, class_deadlines

API Endpoints

• POST /courses (educator) -- create course
• GET /courses (educator) -- list my courses
• POST /courses/:id/sections (educator) -- add section
• POST /courses/sections/:id/content (educator) -- add content to section
• POST /classes (educator) -- create class with enrollment code
• POST /classes/enroll (any authenticated user) -- enroll via code
• GET /classes/:id/roster (educator) -- enrolled students
• GET /classes/:id/analytics (educator) -- class performance data
• POST /classes/:id/deadlines (educator) -- assign deadline

Test plan

• Create course, add sections and content as educator
• Create class and verify unique enrollment code generated
• Enroll student via code and verify roster
• Verify duplicate enrollment returns 409 Conflict
• Check analytics endpoint returns structured data
• Confirm tsc --noEmit passes with 0 errors

Closes #50

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