Replace hardcoded gamma/saturation/brightness fields with a flexible
filter pipeline architecture. Templates now contain an ordered list of
filter instances, each with its own options schema. Filters operate on
full images before border extraction.
- Add filter framework: base class, registry, image pool, filter instance
- Implement 6 built-in filters: brightness, saturation, gamma, downscaler, pixelate, auto crop
- Move smoothing from PP templates to device stream settings (temporal, not spatial)
- Add GET /api/v1/filters endpoint for available filter types
- Dynamic filter UI in template modal with add/remove/reorder/collapse
- Replace camera icon with display icon for screen capture streams
- Legacy migration: existing templates auto-convert flat fields to filter list
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
alexei.dolgolyov
ebd6cc7d7d