fix(combo): type the custom-model row in the auto pool check

[HouMinXi]

Summary

• npm run typecheck:noimplicit:core fails on release/v3.8.52 at open-sse/services/combo/autoStrategy.ts. The callback in customModels.some has an implicit any because getCustomModels returns JSON.parse.
• The callback only reads id. A missing id is skipped by the existing m.id && check. The annotation is { id?: string }, which matches that read. It does not change runtime behavior.
• Related to fix(backend): typecheck:noimplicit:core fails — implicit any in open-sse/services/combo/autoStrategy.ts:519 #15437

Validation

• npm run typecheck:noimplicit:core exits 0 after the change
• Removing the annotation makes the same command fail with TS7006 on this callback, then restoring it passes again
• Forge review, two LOCAL runs on review-default: 0 CONFIRMED. The surviving UNCERTAIN notes disagree with each other (one says id is required, one says the row might not be an object). getCustomModels at src/lib/db/models.ts returns JSON.parse or [], so id is not a required typed field. The receipt line-count note is an excerpt check, not a product defect.

Tests Added Or Updated

• None. The failing check is the repository typecheck command. No runtime branch changed.

Coverage Notes

• Not applicable. Type annotation only.

Reviewer Notes

• addCustomModel stores objects with id: modelId. The read path does not re-validate that shape, which is existing behavior. This change does not parse or trust a new field.