Cloud customers sign in with the control-plane credentials they already
hold, so there is no second password to manage. Two accepted consequences,
documented at the handler: their control-plane password now also unlocks
billing, and only role owner may sign in -- admin and member are refused
because billing is an owner concern.
A self-hosted customer_users row wins over a control-plane user with the
same address, so the precedence is chosen rather than emergent.
Adds the reads of control users this needs; the write surface is still one
UpdateOne on instances.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
mrhid6andClaude Opus 5
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