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>

facefusion.ini

@@ -0,0 +1,42 @@
+[paths]
+temp_path = /data/temp
+jobs_path = /data/jobs
+
+[face_detector]
+face_detector_model = yolo_face
+face_detector_size = 640x640
+face_detector_score = 0.5
+
+[face_landmarker]
+face_landmarker_model = 2dfan4
+
+[face_selector]
+face_selector_mode = reference
+face_selector_order = large-small
+
+[face_masker]
+face_occluder_model = xseg_1
+face_parser_model = bisenet_resnet_34
+face_mask_types = box
+
+[processors]
+processors = face_swapper
+face_swapper_model = hyperswap_1a_256
+
+[output_creation]
+output_image_quality = 80
+output_video_preset = veryfast
+output_video_quality = 80
+
+[execution]
+execution_thread_count = 4
+
+[memory]
+video_memory_strategy = moderate
+
+[download]
+download_providers = github huggingface
+download_scope = lite
+
+[misc]
+log_level = info