feat: plugin SDK, GPU sandbox, waveform v2, accessibility
Plugin SDK:
- Abstract TTSPlugin base class with register/discover pattern
- Built-in plugins: ElevenLabs (cloud) + Bark (local)
- Auto-discovery from backend/plugins/ directory
- GET /tools/plugins API for frontend engine picker
GPU Crash Sandbox:
- Subprocess isolation for GPU-intensive operations
- CUDA OOM / driver crash kills worker, not the server
- Async wrapper with configurable timeout
- Platform availability check
Waveform Timeline v2:
- Added MinimapPlugin (20px overview bar)
- Added TimelinePlugin (time labels)
- Keyboard shortcuts: J/K/L (rewind/play/forward), Space
- Full ARIA labels on all controls
- role=region, role=toolbar for assistive tech
Accessibility:
- ARIA labels on waveform controls, theme picker, capture button
- role=radiogroup on theme dots
- aria-checked state on theme selection
- Keyboard hint icon (J/K/L) in waveform toolbar
LLM Translation: already implemented (OpenAI provider in dub_translate)
Roadmap: cleaned up, only batched TTS + vision items remain
debpalash
b054249be2