List Source Options

The source filter's options: the sources this tenant actually has.

Not the whole vocabulary. A tenant with no PMS should not be offered a PMS filter that can only ever return nothing, and the pms:<provider> keys cannot be enumerated in advance anyway — which is the same reason the frontend must not hardcode this list.

Declared before /customer-profiles/{customer_profile_id} so the literal path wins; FastAPI matches in declaration order and would otherwise read "source-options" as a profile id.