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>

docker-compose.yml

@@ -0,0 +1,20 @@
+services:
+  api:
+    build:
+      context: .
+      args:
+        VARIANT: cpu
+    ports:
+      - "8000:8000"
+    volumes:
+      - ./data/uploads:/data/uploads
+      - ./data/outputs:/data/outputs
+      - ./data/models:/data/models
+      - ./data/temp:/data/temp
+      - ./data/jobs:/data/jobs
+    environment:
+      - FF_EXECUTION_PROVIDERS=["cpu"]
+      - FF_EXECUTION_THREAD_COUNT=4
+      - FF_VIDEO_MEMORY_STRATEGY=moderate
+      - FF_LOG_LEVEL=info
+    restart: unless-stopped