The admin user IS the platform admin — no separate vendor user needed.
The saas-vendor role is now always assigned to the admin user during
bootstrap. Removes VENDOR_ENABLED, VENDOR_USER, VENDOR_PASS from all
config, prompts, compose templates, and bootstrap script.
In multi-tenant mode: admin logs in with saas-admin credentials, gets
platform:admin scope via saas-vendor role, manages tenants directly.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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