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

env.example

@@ -0,0 +1,9 @@
+# NPM MCP Configuration
+NPM_API_URL=http://localhost:81/api
+NPM_IDENTITY=admin@example.com
+NPM_SECRET=changeme
+
+# Server Configuration
+NPM_MCP_HOST=0.0.0.0
+NPM_MCP_PORT=8000
+NPM_MCP_TRANSPORT=stdio  # stdio or http