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Implements the GET /api/courses/[courseId]/analytics endpoint and an instructor-facing stats page for course engagement. The endpoint aggregates per-participant contributions (questions asked, answers given, upvotes received) tagged with each participant's CourseEnrollment role, plus a contiguous weekly time series of questions, answers, and active users, using Prisma groupBy and a single date_trunc aggregation query. Access is restricted to enrolled PROFESSOR/TA (401/403/404 follow the existing API error format), and the optional from/to/weekStart query params are validated with the standard ValidationResult pattern.
The stats page at /courses/[courseId]/analytics renders summary cards, a weekly engagement chart with trend lines, and a sortable role-tagged participant leaderboard, with time range filtering (today, this week, this month, last 4 weeks, or a custom range). Includes unit tests for validation and DB integration tests covering aggregation, authorization, and cross-course isolation.
Notes: Anonymous posts are counted and attributed to their real author in aggregate stats only; no per-post content is exposed by the endpoint.
Closes #75