The /admins create/patch endpoints now plumb email through to the
repo so the dashboard's invite + edit forms aren't silently dropping
it on the floor. Discovered during smoke testing — the database
column existed and was exposed in the response DTO, but neither
the request DTO nor the repo's create() accepted it.
CreateAdminRequest gains optional email; PatchAdminRequest gains
email with JSON Merge Patch semantics:
absent → don't change
null → clear (write NULL)
"<string>" → set to that value
The tri-state needs Option<Option<String>> with a tiny custom
deserializer; serde collapses absent and null otherwise.
normalize_email() trims, treats blanks as None, and rejects
obviously bogus values (no '@', >254 chars) with a 422. Real
email verification is a future concern.
Repo trait gains an email parameter on create() and a new
update_email() method. The unique-violation branch in create now
inspects constraint() to distinguish duplicate username from
duplicate email.
Integration test exercises create-with-email, PATCH null clears,
PATCH value sets, PATCH without email key no-ops on email.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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