standalone api module

[dnbrwstr]

Summary

Standalone API follow-up on top of db/api-move-only focused on dependency-boundary cleanup, not product behavior changes.

This PR makes @tloncorp/api more independently publishable by removing direct shared/react-query/Expo coupling from the API package and enforcing boundaries in ESLint.

Changes

• API package boundary cleanup:
  • remove @tloncorp/shared dependency/imports from packages/api.
  • remove API-owned react-query export/surface (queryClient/QueryClientProvider) and move consumers back to shared-owned react-query modules.
  • remove Expo dependencies from API (expo-contacts, expo-localization) and shift contacts integration to app side via provider configuration.
• Mobile wiring:
  • add a mobile-only system contacts provider and register it at app startup.
  • keep API side provider-driven and platform-agnostic.
• Boundary enforcement (ESLint-only):
  • add root ESLint overrides to block:
    • packages/api/src/** importing @tloncorp/shared* and ../client*.
    • apps/** importing internal @tloncorp/api/{client,api,lib,types/native}* entrypoints.
  • fix two API internal violations surfaced by those rules (lib/references, lib/branch).
• Packaging/metadata:
  • update packages/api/package.json + lockfile to reflect dependency removals.

How did I test?

• pnpm -r tsc
• pnpm -r lint
• pnpm --filter @tloncorp/api lint

Diff size

• db/standalone-api vs origin/develop: 593 insertions, 402 deletions (995 LOC churn)
• db/api-move-only vs origin/develop: 568 insertions, 402 deletions (970 LOC churn)
• Delta vs move-only baseline: +25 LOC

Risks and impact

• Safe to rollback without consulting PR author? Yes
• Affects important code area:
  • Onboarding
  • State / providers
  • Message sync
  • Channel display
  • Notifications
  • Other: package boundaries / module resolution / dependency graph

Rollback plan

• Revert the PR.
• If needed, revert boundary-enforcement changes first (ESLint overrides), then revert API dependency-boundary changes.

Screenshots / videos

• N/A