feat: Implement SSH Agent Connector and gRPC server

- Added `AgentConnectorTrait` and `AgentConnector` for managing agent connections.
- Introduced `SshAgentConnector` to handle SSH-related functionalities and start a gRPC server.
- Created database entities for `agents`, `certificates`, `organizations`, `public_key_revocations`, `setup_tokens`, `upstreams`, `users`, `virtual_hosts`, and `workspaces` using SeaORM.
- Developed `CertificateService` for managing certificate generation and retrieval.
- Implemented the main server logic to initialize the database connection and start the agent server.
- Configured development settings in `development.toml` for server and database connections.

apps/nxmesh-master/Cargo.toml

@@ -37,8 +37,7 @@ tower.workspace = true
 tower-http = { workspace = true, features = ["fs", "cors"] }
 
 # OpenAPI
-utoipa = { version = "4", features = ["axum_extras"] }
-utoipa-swagger-ui = { version = "6", features = ["axum"] }
+utoipa = { version = "5.4", features = ["axum_extras"] }
 
 # gRPC
 tonic.workspace = true
@@ -79,6 +78,12 @@ handlebars.workspace = true
 
 # Random generation
 rand = "0.10"
+clap = { workspace = true, features = ["derive"] }
+rcgen = { version = "0.14.7", features = ["x509-parser"] }
+time = "0.3"
+
+# Cert handling
+zip = { workspace = true }
 
 [dev-dependencies]
 tokio-test.workspace = true