fix: add missing disableSignUp to auth config objects in CLI

All auth config literals in the CLI were missing the required
disableSignUp field after it was added to authConfigSchema.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

cli/src/__tests__/allowed-hostname.test.ts

@@ -42,6 +42,7 @@ function writeBaseConfig(configPath: string) {
     },
     auth: {
       baseUrlMode: "auto",
+      disableSignUp: false,
     },
     storage: {
       provider: "local_disk",