feat: Initial NPM MCP server implementation

- NpmClient with JWT auth and auto-refresh
- FastMCP server with 5 tools (list_proxy_hosts, get_proxy_host_details, get_system_health, search_audit_logs, list_certificates)
- Docker support with multi-stage build using uv
- Supports stdio and streamable HTTP transports
- GitHub Actions for tests and Docker builds

.gitignore

@@ -0,0 +1,37 @@
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# Virtual environments
+.venv/
+venv/
+ENV/
+
+# Distribution / packaging
+build/
+dist/
+*.egg-info/
+*.egg
+
+# IDE
+.idea/
+.vscode/
+*.swp
+*.swo
+
+# Environment files with secrets
+.env
+
+# Test / coverage
+.pytest_cache/
+.coverage
+htmlcov/
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Internal dev docs
+mcp.md
+*.code-workspace