Initial commit: Revids REST API for LTX-2.3 image-to-video generation

- FastAPI with job polling: POST /generate, GET /jobs/{id}, /download, /health
- SQLite job persistence (aiosqlite), background task processing
- LTX-2.3 DistilledPipeline via native ltx-pipelines (editable install from submodule)
- Configurable model paths, LoRA support, FP8 quantization via env vars
- Single-concurrency GPU lock for safe inference
- LTX-2 as git submodule under libs/

requirements.txt

@@ -0,0 +1,7 @@
+fastapi>=0.115.0
+uvicorn[standard]>=0.33.0
+python-multipart>=0.0.12
+Pillow>=11.0.0
+aiosqlite>=0.20.0
+pydantic-settings>=2.6.0
+imageio[ffmpeg]>=2.34.0