feat: add pagination to list endpoints #1

High Priority#

Location: src/index.ts

Endpoints without pagination:#

• /api/transcriptions GET (line 1797)
• /api/admin/transcriptions GET (line 1939)
• /api/admin/users GET (line 1950)
• /api/classes GET

Impact#

Memory exhaustion, slow responses with large datasets

Fix Time#

~2 hours

Recommendation#

Implement cursor-based or offset pagination (limit 50-100 per page)

From LAUNCH_REVIEW.md Issue #10