refactor(auth): simplify AdminGuard constructor and register it in AuthModule

The AdminGuard constructor is being simplified by using constructor parameter properties, rather than previously setting properties via Reflector in the constructor's body. Additionally, AuthModule now includes AdminGuard in its providers.

src/auth/auth.guard.ts

@@ -49,14 +49,10 @@ export class UserGuard implements CanActivate {
 
 @Injectable()
 export class AdminGuard implements CanActivate {
-  private readonly credentialService: CredentialsService;
+  constructor(
-  private readonly databaseService: DrizzleService;
+    private readonly credentialService: CredentialsService,
-
+    private readonly databaseService: DrizzleService
-  constructor() {
+  ) {}
-    const reflector = new Reflector();
-    this.credentialService = reflector.get<CredentialsService>('CredentialsService', UserGuard);
-    this.databaseService = reflector.get<DrizzleService>('DrizzleService', UserGuard);
-  }
 
   async canActivate(
     context: ExecutionContext,

src/auth/auth.module.ts

@@ -3,10 +3,11 @@ import { CredentialsModule } from "src/credentials/credentials.module";
 import { DrizzleModule } from "src/drizzle/drizzle.module";
 import { AuthController } from "./auth.controller";
 import { AuthService } from "./auth.service";
+import { AdminGuard } from "src/auth/auth.guard";
 
 @Module({
 	imports: [DrizzleModule, CredentialsModule],
-	providers: [AuthService],
+	providers: [AuthService, AdminGuard],
 	controllers: [AuthController],
 })
 export class AuthModule {}