[Barrel #59 Phase 2] Migrate 117 src/app/ files from localDb barrel to direct db/ imports

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Part of #11782 (tracks #59 on the fork)

Summary

Phase 2 of Issue #59: replace all barrel imports from @/lib/localDb with direct imports to the specific db/ modules in src/app/.

117 files changed, 268 insertions, 235 deletions. Zero barrel imports remain in src/app/.

What this does

Every import { ... } from "@/lib/localDb" in src/app/ has been rewritten to point directly at the owning db/ module:

- import { listBatches } from "@/lib/localDb";
+ import { listBatches } from "@/lib/db/batches";

- import { getSettings, isCloudEnabled } from "@/lib/localDb";
+ import { getSettings, isCloudEnabled } from "@/lib/db/settings";

Aliased exports are preserved:

- import { updateWebhookRecord } from "@/lib/localDb";
+ import { updateWebhook as updateWebhookRecord } from "@/lib/db/webhooks";

Why

• AGENTS.md says: "Never barrel-import from localDb.ts — import specific db/ modules instead"
• Vercel best practice bundle-barrel-imports: "Import directly, avoid barrel files"
• 171 files were violating this convention; this phase covers 117 of them

Testing

• All changes are mechanical import path rewrites — no logic changes
• The ESLint rule no-restricted-imports (already in eslint.config.mjs) will prevent regressions
• Each file was verified: rg -c "from.*@/lib/localDb" src/app/ --type ts returns 0 after this change

Dependencies

This PR targets release/v3.8.51. It should be merged before Phase 5 (barrel deletion).