As a tenant Admin I want the legacy flat service switches retired once every resource carries a services config.

[nopivnick]

Follow-up to #1594.

The request form renders services two ways: the schema-driven per-room service sections, and a legacy fallback of tenant-level flat switches (setup, equipment, staffing, catering, cleaning, security) used when no selected room carries a services config. #1594 moves both paths to the Services step unchanged.

This issue retires the fallback:

• Confirm every tenant's resources carry a services config (or migrate them)
• Remove the flat-switch rendering and its effects (catering→cleaning, 75+ security) from the legacy path, keeping the schema-driven equivalents
• Treat rooms without a services config as offering no services
• Remove form.services tenant flags that only the fallback consumed, per the direction in As an MC Admin I want to refactor the request form. #1408