* fix(routing): fallback to default model alias seeds when unmapped in database
* fix(routing): rename seed-fallback resolver; hermetic 401 regression test
Maintainer review (PR #10124):
1. Rename resolveModelAlias -> resolveModelAliasWithSeedFallback (and
resolveModelAliasOnBody -> resolveModelAliasWithSeedFallbackOnBody) to
avoid the export collision with the sync resolveModelAlias in
open-sse/services/modelDeprecation.ts and
src/shared/constants/modelSpecs.ts.
2. Regression test now reproduces the 401: alias unmapped in the (empty,
DATA_DIR-isolated) modelAliases namespace but present in the static seed
resolves to the seed target instead of passing through unmapped.
3. Test isolates DATA_DIR (temp dir + resetDbInstance) instead of reading
the operator's live DB.
* fix(models): add outputTokenLimit to CustomModelEntry
Fixes the open-sse typecheck gate regression: catalog.ts reads
model.outputTokenLimit (for max_output_tokens in custom model metadata)
but CustomModelEntry only declared inputTokenLimit — TS2551. The
field exists in the runtime model data and is already consumed; the
interface just never declared it.
