fix(barrel): migrate open-sse, src/shared, src/sse, src/models, src/domain off the @/lib/localDb barrel import (#11795 Phase 4) (#12053)

Resynced onto the release tip after #12051/#12052 landed. One real conflict in open-sse/services/combo.ts at both LKGP-clear call sites (handleComboChat + round-robin path): the release tip already has #12013's clearStaleLKGP() helper, which this PR's branch predates — kept the current helper call at both sites, discarding the pre-refactor inline pattern. typecheck:core and the open-sse test suite (vitest, 9/9 on volumeDetector) both green after resync. Thanks for the well-scoped Phase 4 migration.

src/shared/utils/apiKeyPolicy.ts

@@ -9,12 +9,8 @@
  */
 
 import { extractApiKey } from "@/sse/services/auth";
-import {
-  getApiKeyMetadata,
-  getComboByName,
-  isModelAllowedForKey,
-  getApiKeyById,
-} from "@/lib/localDb";
+import { getApiKeyMetadata, isModelAllowedForKey, getApiKeyById } from "@/lib/db/apiKeys";
+import { getComboByName } from "@/lib/db/combos";
 import { isDashboardSessionAuthenticated } from "./apiAuth";
 import { resolveComboForModel } from "@/lib/db/modelComboMappings";
 import { checkBudget } from "@/domain/costRules";