Rate Limiting:
- Add @nestjs/throttler with 100 req/min global limit
- Stricter limits for uploads: 20 req/min single, 10 req/min multi
File Versioning (Backend):
- GET /api/v1/files/:id/versions — list version history
- POST /api/v1/files/:id/versions — upload new version with optional comment
- Updates file metadata (size, name, storageKey) on new version
- 7 new tests for versioning service and controller
API Client (Frontend):
- Add FileVersion interface
- Add filesApi.getVersions() and filesApi.uploadVersion()
Total tests: 205 (140 backend + 65 web)
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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