Add REST API server, Docker support, and CI pipeline

- Add FastAPI-based REST API server (api_server.py)
- Add Dockerfile and docker-compose.yaml for containerized deployment
- Add Gitea Actions CI workflow for building and pushing images
- Refactor CLI to support dual-server SSH (bouncer + crowdsec)
- Update dependencies with FastAPI and uvicorn
- Update CLAUDE.md and README.md with full documentation

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

docker-compose.yaml

@@ -0,0 +1,47 @@
+services:
+  # CLI 모드 (일회성 명령 실행)
+  cli:
+    build: .
+    image: cf-bouncer-manager:latest
+    volumes:
+      - ~/.ssh:/root/.ssh:ro
+      - ./data:/root/cf-bouncer-manager
+    environment:
+      - CFB_BOUNCER_HOST=${CFB_BOUNCER_HOST:-}
+      - CFB_BOUNCER_PORT=${CFB_BOUNCER_PORT:-22}
+      - CFB_BOUNCER_USER=${CFB_BOUNCER_USER:-root}
+      - CFB_BOUNCER_KEY=${CFB_BOUNCER_KEY:-}
+      - CFB_CROWDSEC_HOST=${CFB_CROWDSEC_HOST:-}
+      - CFB_CROWDSEC_PORT=${CFB_CROWDSEC_PORT:-22}
+      - CFB_CROWDSEC_USER=${CFB_CROWDSEC_USER:-root}
+      - CFB_CROWDSEC_KEY=${CFB_CROWDSEC_KEY:-}
+    entrypoint: ["uv", "run", "python", "cf_bouncer.py"]
+    command: ["--help"]
+
+  # API 서버 모드
+  api:
+    build: .
+    image: cf-bouncer-manager:latest
+    ports:
+      - "8000:8000"
+    volumes:
+      - ~/.ssh:/root/.ssh:ro
+      - ./data:/root/cf-bouncer-manager
+    environment:
+      - CFB_BOUNCER_HOST=${CFB_BOUNCER_HOST:-}
+      - CFB_BOUNCER_PORT=${CFB_BOUNCER_PORT:-22}
+      - CFB_BOUNCER_USER=${CFB_BOUNCER_USER:-root}
+      - CFB_BOUNCER_KEY=${CFB_BOUNCER_KEY:-}
+      - CFB_CROWDSEC_HOST=${CFB_CROWDSEC_HOST:-}
+      - CFB_CROWDSEC_PORT=${CFB_CROWDSEC_PORT:-22}
+      - CFB_CROWDSEC_USER=${CFB_CROWDSEC_USER:-root}
+      - CFB_CROWDSEC_KEY=${CFB_CROWDSEC_KEY:-}
+      - CFB_API_HOST=0.0.0.0
+      - CFB_API_PORT=8000
+    entrypoint: ["uv", "run", "uvicorn", "api_server:app", "--host", "0.0.0.0", "--port", "8000"]
+    restart: unless-stopped
+    healthcheck:
+      test: ["CMD", "curl", "-f", "http://localhost:8000/health"]
+      interval: 30s
+      timeout: 10s
+      retries: 3