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/mod.rs

@@ -2,5 +2,20 @@
 
 pub mod prelude;
 
+pub mod access_rule;
+pub mod agent_config_binding;
+pub mod agent_group;
 pub mod agents;
+pub mod cache_zone;
+pub mod config_inheritance;
+pub mod limit_rule;
+pub mod limit_zone;
+pub mod location_block;
+pub mod log_setting;
+pub mod proxy_config;
+pub mod proxy_setting;
 pub mod public_key_revocations;
+pub mod rewrite_rule;
+pub mod server_block;
+pub mod ssl_certificate;
+pub mod upstream;