Initial implementation of n8n MCP server

Implements Hybrid MCP Light pattern with:
- 5 curated tools: list_workflows, get_workflow, list_executions, get_execution, trigger_webhook
- API pass-through tool: n8n_api_call for complete coverage
- API reference resource: n8n://api-reference
- Dockerfile and CI workflow for Gitea container registry

Dockerfile

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+FROM python:3.12-slim
+
+WORKDIR /app
+
+# Install uv for fast dependency management
+COPY --from=ghcr.io/astral-sh/uv:latest /uv /usr/local/bin/uv
+
+# Copy project files
+COPY pyproject.toml .
+COPY server.py .
+COPY README.md .
+
+# Install dependencies
+RUN uv pip install --system --no-cache .
+
+# Install curl for health checks
+RUN apt-get update && apt-get install -y --no-install-recommends curl && \
+    rm -rf /var/lib/apt/lists/*
+
+EXPOSE 8000
+
+HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
+    CMD curl -f http://localhost:8000/health || exit 1
+
+CMD ["python", "server.py"]