feat: add provisioning fields to tenants + license revoke

Adds server_endpoint and provision_error columns to tenants table (V011 migration),
updates TenantEntity and TenantResponse with new fields and a from() factory,
adds revokeLicense() to LicenseService, and updates TenantController to use the factory.

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

src/main/resources/db/migration/V011__add_provisioning_fields.sql

@@ -0,0 +1,3 @@
+-- V011__add_provisioning_fields.sql
+ALTER TABLE tenants ADD COLUMN server_endpoint VARCHAR(512);
+ALTER TABLE tenants ADD COLUMN provision_error TEXT;