Remove dead TypeScript exports

[snbafana]

Summary

• Remove confirmed zero-call-site TypeScript exports and constants from platform, telemetry, setup, and schema owners
• Clean up imports that became unused after the deletions
• Keep the change to deletion-only cleanup with no new abstractions or file splits

Verification

• rg recheck for every removed symbol
• pnpm typecheck
• pnpm check:biome
• pnpm test src/platforms/linkedin/api/request.test.ts src/platforms/linkedin/sync/events.test.ts src/platforms/contacts/sync.test.ts src/platforms/whatsapp/helper/status.ts src/db/database.test.ts src/core/types/provider.test.ts
• Commit hook: pnpm check:app-quality
• Push hook: pnpm check:ci-local, including pnpm build, pnpm test, and swift build --package-path native/macos/CuedNative -c release

Stack

• Base: codex/cued-quality-01-slack-projection-busy (Fix Slack realtime projection fallback #60)
• Previous: Fix Slack realtime projection fallback #60
• Next: codex/cued-quality-03-no-op-api-cleanup