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/src/db/entities/virtual_hosts.rs

@@ -0,0 +1,44 @@
+//! `SeaORM` Entity, @generated by sea-orm-codegen 2.0
+
+use sea_orm::entity::prelude::*;
+use serde::{Deserialize, Serialize};
+
+#[derive(Clone, Debug, PartialEq, Eq, DeriveEntityModel, Serialize, Deserialize)]
+#[sea_orm(table_name = "virtual_hosts")]
+pub struct Model {
+    #[sea_orm(primary_key, auto_increment = false)]
+    pub id: Uuid,
+    pub workspace_id: Uuid,
+    pub name: String,
+    pub server_name: String,
+    pub listen_port: i32,
+    pub ssl_enabled: bool,
+    pub ssl_certificate_id: Option<Uuid>,
+    pub locations: Option<Json>,
+    pub http2_enabled: bool,
+    pub http3_enabled: bool,
+    pub gzip_enabled: bool,
+    pub target_agents: Option<Json>,
+    pub created_at: DateTimeWithTimeZone,
+    pub updated_at: DateTimeWithTimeZone,
+}
+
+#[derive(Copy, Clone, Debug, EnumIter, DeriveRelation)]
+pub enum Relation {
+    #[sea_orm(
+        belongs_to = "super::workspaces::Entity",
+        from = "Column::WorkspaceId",
+        to = "super::workspaces::Column::Id",
+        on_update = "NoAction",
+        on_delete = "Cascade"
+    )]
+    Workspaces,
+}
+
+impl Related<super::workspaces::Entity> for Entity {
+    fn to() -> RelationDef {
+        Relation::Workspaces.def()
+    }
+}
+
+impl ActiveModelBehavior for ActiveModel {}