feat: add new database entities and migration for proxy configuration

- Introduced `log_setting`, `proxy_config`, `proxy_setting`, `rewrite_rule`, `server_block`, `ssl_certificate`, and `upstream` entities with their respective fields and relationships.
- Updated `mod.rs` and `prelude.rs` to include new entities.
- Created migration script to set up new tables and relationships in the database.
- Altered existing `agents` table to include a foreign key reference to `agent_group`.

apps/nxmesh-master/src/db/entities/upstream.rs

@@ -0,0 +1,54 @@
+//! `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 = "upstream")]
+pub struct Model {
+    #[sea_orm(primary_key, auto_increment = false)]
+    pub id: Uuid,
+    pub config_id: Uuid,
+    pub name: String,
+    pub target_host: String,
+    pub target_port: i32,
+    #[sea_orm(column_type = "JsonBinary", nullable)]
+    pub metadata: Option<Json>,
+    pub override_of_id: Option<Uuid>,
+}
+
+#[derive(Copy, Clone, Debug, EnumIter, DeriveRelation)]
+pub enum Relation {
+    #[sea_orm(has_many = "super::location_block::Entity")]
+    LocationBlock,
+    #[sea_orm(
+        belongs_to = "super::proxy_config::Entity",
+        from = "Column::ConfigId",
+        to = "super::proxy_config::Column::Id",
+        on_update = "Cascade",
+        on_delete = "Cascade"
+    )]
+    ProxyConfig,
+    #[sea_orm(
+        belongs_to = "Entity",
+        from = "Column::OverrideOfId",
+        to = "Column::Id",
+        on_update = "Cascade",
+        on_delete = "SetNull"
+    )]
+    SelfRef,
+}
+
+impl Related<super::location_block::Entity> for Entity {
+    fn to() -> RelationDef {
+        Relation::LocationBlock.def()
+    }
+}
+
+impl Related<super::proxy_config::Entity> for Entity {
+    fn to() -> RelationDef {
+        Relation::ProxyConfig.def()
+    }
+}
+
+impl ActiveModelBehavior for ActiveModel {}