[Barrel #59 Phase 3] Migrate 32 src/lib/ files from localDb barrel to direct db/ imports

[jonlwheat2-gif]

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

Summary

Phase 3 of Issue #59: replace all barrel imports from @/lib/localDb with direct imports to the specific db/ modules in src/lib/.

32 files changed, 80 insertions, 91 deletions. Zero barrel imports remain in src/lib/ (excluding the barrel file itself).

What this does

Same mechanical rewrite as Phase 2, applied to the service/handler layer:

- import { getProviderConnections, getCachedSettings } from "@/lib/localDb";
+ import { getProviderConnections } from "@/lib/db/providers";
+ import { getCachedSettings } from "@/lib/db/readCache";

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"
• This phase covers the 32 src/lib/ consumers

Testing

• Mechanical import path rewrites — no logic changes
• Verified: rg -c "from.*@/lib/localDb" src/lib/ --type ts returns 0 (excluding the barrel file)

Dependencies

Should be merged after Phase 2 and before Phase 5 (barrel deletion).