Add whisper remote backend and CLI

backend/README.md

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+# whisper-remote-backend
+
+FastAPI wrapper around the upstream `whisper` CLI from `openai/whisper`.
+
+## Run
+
+```bash
+pip install -e .
+uvicorn whisper_remote_backend.server:app --host 0.0.0.0 --port 8000
+```
+
+## API
+
+`POST /transcriptions`
+
+Multipart form fields:
+
+- `file`: media file
+- `model`: Whisper model name
+- `language`: optional language code
+- `output_format`: `txt`, `vtt`, `srt`, `tsv`, or `json`
+
+The response body is the transcript artifact itself. The backend deletes the uploaded file and generated output after each request.