feat: stub agent file structure

crates/nxmesh-agent/src/nginx/mod.rs

@@ -0,0 +1,9 @@
+//! Nginx management
+
+pub mod config_manager;
+pub mod config_renderer;
+pub mod controller;
+pub mod docker_sidecar;
+pub mod parser;
+pub mod systemd;
+pub mod validator;