* feat(dashboard): replace free-text model inputs with hidePaid-aware Selects (#6540)
Swap RoutingTab.webSearchRouteModel, ComboDefaultsTab.handoffModel, and
BackgroundDegradationTab's from/to fields from free-text inputs to a new
shared ModelSelectField fed by the already hidePaidModels-aware
GET /api/models, with an off-catalog "(custom)" fallback so an existing
saved value is never silently dropped. ModelRoutingSection's glob pattern
field gets a fail-open "matches only paid models" warning instead, since
it's a wildcard matcher rather than a single model id.
Adds save-time paid-target rejection (PAID_MODEL_TARGET_BLOCKED, 400) on
PATCH /api/settings, PATCH /api/settings/combo-defaults, and PUT
/api/settings/background-degradation when hidePaidModels is on, failing
open for aliases/combo names/unrecognized providers.
globToRegex is extracted from lib/db/modelComboMappings.ts into a new
dependency-free shared/utils/globPattern.ts so both the DB module and the
new client-side pattern heuristic reuse the same regex-building logic.
* refactor(6540): extract paid-target guard in background-degradation PUT
The inline hidePaid check nested if>if>for>if inside the PUT handler,
pushing its cognitive complexity to 16 (>15) — a NEW violation that broke
the check:complexity-ratchets gate (891 > baseline 890). Extracted the
check into a module-local hasBlockedPaidTarget() helper; behaviour and
response body are unchanged. cognitive-complexity back to 890 = baseline.
* fix(i18n): mirror paidModelPatternWarning into pt-BR.json (#6540)
The new key landed only in en.json; the i18n pt-BR integrity test
(no drift, #6695) requires pt-BR.json to carry every en.json key.
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