chore: merge master → dev/video-fer (SSE transcribe-stream)

docs: update README with Studio features and API format

refactor: restructure repo into api/ proxy/ web/ training/ docs/

docs: update READMEs for evoxtral external API proxy

feat: add HuggingFace Spaces Docker deployment

docs: update READMEs to reflect single-speaker VAD segmentation

feat: update frontend, diarize endpoint, and emotion analysis

feat: backend-only model+server layers, API docs

docs: update project README

Initial commit from Create Next App