feat(proxy): add proxy service module with configuration handling

- Introduced a new `proxy` module in the service layer.
- Created `ProxyServiceTrait` for managing proxy configurations.
- Implemented various configuration types including access rules, cache zones, limit rules, and more.
- Added rendering logic for Nginx configuration components.
- Developed a repository implementation for fetching and merging proxy configurations from the database.
- Enhanced error handling with `ProxyServiceError` for better clarity on configuration issues.

apps/nxmesh-master/src/service/mod.rs

@@ -6,6 +6,7 @@ use crate::{connector::agent::AgentConnectorTrait, service::certificate::Certifi
 
 pub mod agent;
 pub mod certificate;
+pub mod proxy;
 
 pub async fn start_master_server(
     settings: crate::config::settings::Settings,