[Activity Phase 1] Deliver 교육활동 MVP in course detail

[cursor]

Summary

• Deliver ALTSIS 교육활동(Activity) Phase 1 MVP under course (Syllabus) detail using the existing Alt Board/AltForm/AltSheetRow execution engine.
• Includes backend models/APIs/services/routes for Activity, ActivityTemplate, and ActivitySubmission with season permission (permissionActivityV2) and CalendarEvent sync using sourceType: "activity".
• Includes builtin templates: assignment(과제), quiz(퀴즈), discussion(토론) and template flows (create/edit/duplicate/instantiate).
• Includes frontend activity domain types + useAPIv2 integration (ActivityAPI, ActivityTemplateAPI) and course detail tabs for both mentoring/enrolled views.
• Hardens MVP visibility rules by blocking non-mentor access to draft activities/submissions at API level (backend/src/controllers/activities.js).

Test Plan

1. Backend route-level smoke check (manual):
   • Create activity from builtin template via CActivityFromTemplate.
   • Publish activity.
   • Verify student submission lifecycle (not_started -> submitted) and teacher feedback persistence.
2. Permission check:
   • With permissionActivityV2=true, mentors can manage and enrolled students can submit.
   • Non-mentor users cannot fetch draft activities via API.
3. Calendar sync check:
   • Confirm due date creates personal CalendarEvent entries with sourceType: "activity" for enrolled students.
4. Automated tests attempted:
   • cd backend && yarn test
   • Result in this CI environment: fails due pre-existing test setup issues (setupFiles ./env.js missing and @models/* mapper mismatch), unrelated to this change set.

Known Limitations

• Legacy data may require admin permission setup (permissionActivityV2) and lazy builtin template initialization path.
• Activity-specific automated backend tests are still not present in this branch.
• This PR intentionally excludes Phase 2+ scope (evaluation bridge, timeline/dashboard, AI tutor integration, block canvas editor).

  

[cursor]

Phase 1 MVP implementation for 교육활동 has been completed and pushed, including a backend hardening fix to block non-mentor API access to draft activities/submissions (backend/src/controllers/activities.js).

Validation notes:

• Manual/API flow coverage is included in the PR description.
• backend automated tests could not be executed in this runner due existing test setup issues (jest.setupFiles expects ./env.js, and @models/* mapper points to non-existent path), unrelated to this patch.

Important branch/base note:

• This automation environment auto-created/reused PR #404 from cursor/altsis-education-activity-phase-1-1267 to feature/activity-system.
• Requested target base was 399-feature-altsis-next-project-update-to-v20; please retarget the PR base in GitHub UI if required.

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_{Sent by Cursor Automation: ALTSIS Activity System Phase 1}