feat(schedule): add SQLite schedule storage

[znnnnnnn-wil]

Summary

• Related issue: feat(schedule): 实现日程聚合、PostgreSQL/SQLite 与日历读取闭环 #176
• add Expo SQLite configuration plus versioned local schedule and occurrence-override tables
• separate cloud-owned schedule writes from device-owned reminder runtime updates
• preserve snooze, geofence, next-trigger, disposition, and sync state when applying cloud snapshots
• make local physical cleanup explicit through purgeSchedule while retaining cloud status=deleted rows
• add executable SQLite repository integration tests

Verification

• npm run lint
• prettier --check --end-of-line auto .
• npm run typecheck
• npm run test (6 SQLite behavior tests passed)
• Expo Android export

Scope

This PR contains only client SQLite persistence boundaries. Snapshot orchestration, stale-revision decisions, WebSocket synchronization, AlarmManager/geofence behavior, RRULE expansion, and the complete sync engine remain out of scope.

Replaces the SQLite portion of #191.

[vercel]

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Project	Deployment	Actions	Updated (UTC)
timeflow	Ready	Preview	Aug 11, 2026 8:13am

[fennoai]

No issues found in the changed code. Reviewed the pinned a7d7a7b...058186d diff across code quality, performance, security, and documentation accuracy. Verified npm run check and executed the SQLite schema with integrity and foreign-key checks.

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[Wintercom]

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