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>

.dockerignore

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+.git
+.gitmodules
+facefusion/.git
+data/
+*.md
+!requirements*.txt
+.env
+.env.*
+.venv/
+venv/
+__pycache__/
+*.py[cod]
+.idea/
+.vscode/
+.gitea/
+docker-compose*.yml