Replace NestJS framework with Hono + Bun, eliminating the last
NestJS service from the stack. All business logic preserved:
- CAS upload with SHA-256 dedup
- BullMQ image processing (Sharp thumbnails/variants)
- Matrix MXC URL import
- EXIF extraction
- File streaming/transforms
- Prometheus metrics
23 NestJS files → 12 Hono files. Zero NestJS in the monorepo.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>