PR #5423 relaxed the email suffix whitelist: once a whitelist is
configured, non-whitelisted registrable domains are each allowed to
register one account. That behavior activated unconditionally.
Add registration_email_domain_quota_enabled (default false) to gate it:
- Off (default): restore pre-#5423 strict whitelist semantics — with a
non-empty whitelist, non-whitelisted domains are rejected with
EMAIL_SUFFIX_NOT_ALLOWED; the register/verify views restore the
client-side whitelist pre-check and allowed-domain hint.
- On: keep #5423 behavior — one account per non-whitelisted registrable
domain (EMAIL_DOMAIN_REGISTRATION_LIMIT).
- Empty whitelist keeps allowing all domains in both states.
Gating lives in validateRegistrationEmailQuota and (as a race-safety
backstop) createUserWithRegistrationEmailGuard; the repository-level
domain lock + in-tx recheck is unchanged. The admin update field is
*bool (omitted = keep current) so stale full-payload saves cannot
silently flip the switch. Email binding and OAuth auto-signup keep
their strict policy, and pending-OAuth bind-login for existing
accounts is unaffected because the handler resolves existing emails
before the quota check.
Frontend adds the toggle to admin settings (zh/en copy; whitelist hint
restored to strict wording, quota wording moved to the new toggle) and
exposes the flag via public settings + SSR injection payload.
Tests: #5423 quota tests now enable the switch explicitly; new
default-off regression tests cover register/send-code/async/pending
OAuth/OIDC create-account plus both register views; API contract JSON
and the injection drift guard are updated.
- Add compact_home_enabled setting to provide a minimal landing page
- Preserves custom home_content priority over compact mode
- Renders only site identity, navigation, and login/dashboard link
- Avoids marketing copy that triggers anti-fraud systems
- Includes focused backend/frontend tests and i18n support
Fixes#5065
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