Initial implementation of UniFi MCP Light server

Implements Hybrid MCP Light pattern with:
- 4 specific tools: list_clients, list_devices, get_system_info, get_network_health
- Meta tools: tool_index, api_call (raw API pass-through)
- API documentation resource at unifi://api-reference
- Starlette wrapper with /health endpoint
- Write protection (UNIFI_ALLOW_WRITES env var)
- UniFi OS auto-detection (proxy vs direct paths)
- Docker multi-stage build
- Gitea CI workflow

Closes #1, #2, #3, #4, #5, #7

.gitignore

@@ -0,0 +1,48 @@
+# Python
+__pycache__/
+*.py[cod]
+*$py.class
+*.so
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+
+# Virtual environments
+.venv/
+venv/
+ENV/
+env/
+
+# Environment files
+.env
+.env.local
+.env.*.local
+
+# IDE
+.idea/
+.vscode/
+*.swp
+*.swo
+*~
+
+# Testing
+.pytest_cache/
+.coverage
+htmlcov/
+
+# OS
+.DS_Store
+Thumbs.db