refactor(auth): remove keys auth module and align tests

- remove server auth module and client keys page/routes/api to simplify flow

- update mcp and scenario tests to match uuid routes and step schema

server/src/app.module.ts

@@ -4,7 +4,6 @@ import { AppConfig, validateAppConfig } from "./config/app.config";
 import { TypeOrmModule } from "@nestjs/typeorm";
 import { ScheduleModule } from "@nestjs/schedule";
 import { HealthModule } from "./health/health.module";
-import { AuthModule } from "./auth/auth.module";
 import { BrowserModule } from "./browser/browser.module";
 import { SessionEntity } from "./session/session.entity";
 import { EnvironmentEntity } from "./environment/environment.entity";
@@ -50,7 +49,6 @@ import { SnippetModule } from "./snippet/snippet.module";
         synchronize: true,
       }),
     }),
-    AuthModule,
     BrowserModule,
     EnvironmentModule,
     CredentialModule,