Initial commit: FaceFusion REST API

FastAPI wrapper around FaceFusion v3.5.3 submodule with:
- Sync and async (job-based) processing endpoints
- FaceFusion bridge with manual key registration and Lock-serialized processing
- Multi-target Dockerfile (CPU + CUDA GPU)
- Docker Compose configs for dev, prod-cpu, and prod-gpu
- Gitea CI/CD workflow with dual image builds
- All 11 FaceFusion processors supported via options API

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

requirements.txt

@@ -0,0 +1,12 @@
+fastapi==0.115.6
+uvicorn[standard]==0.34.0
+python-multipart==0.0.18
+pydantic-settings==2.7.1
+psutil==6.1.1
+
+# FaceFusion dependencies (excluding gradio)
+numpy==1.26.4
+opencv-python==4.10.0.84
+onnx==1.17.0
+scipy==1.14.1
+tqdm==4.67.1