feat: implement protocol parity and harden upstream handling (#88)

* feat: implement protocol parity and harden upstream handling

* docs(agents): add lodash-es utility method and named import guideline

src/server/modules/proxy/proxy.module.ts

@@ -3,9 +3,13 @@ import { ProxyController } from './proxy.controller';
 import { ProxyService } from './proxy.service';
 import { TokenManagerService } from './token-manager.service';
 import { GeminiClient } from './clients/gemini.client';
+import { GeminiController } from './gemini.controller';
+import { ProxyGuard } from './proxy.guard';
 
 @Module({
-  controllers: [ProxyController],
-  providers: [ProxyService, TokenManagerService, GeminiClient],
+  imports: [],
+  controllers: [ProxyController, GeminiController],
+  providers: [ProxyService, TokenManagerService, GeminiClient, ProxyGuard],
+  exports: [TokenManagerService],
 })
 export class ProxyModule {}