feat(schedule): implement Agent schedule application service

[znnnnnnn-wil]

Summary

Related issue: feat(schedule): 实现日程聚合、PostgreSQL/SQLite 与日历读取闭环 #176

• implement the five existing Agent-facing schedule operations without changing their names, parameters, return types, Command contracts, or business-error contract
• validate all-day schedules as local-midnight date boundaries in the schedule IANA timezone, including DST days, and preserve omitted update fields byte-for-byte
• resolve find_schedules time bounds as effective occurrence windows through account-scoped Repository candidate filtering, timezone-aware RRULE range queries, and CANCEL/REPLACE overrides
• implement recurring deletion for this_occurrence, this_and_future, and entire_series using local wall time in the schedule IANA timezone
• accept and canonicalize one RRULE only, reject recurrence sets/content lines, normalize invalid ZoneInfo keys, and keep aggregate writes in one application-owned transaction

Verification

• ruff check .
• ruff format --check . (91 files already formatted)
• mypy (58 source files, no issues)
• pytest --cov --cov-report=term-missing --cov-report=xml --cov-fail-under=80 (276 passed, 25 skipped, 90.19% coverage locally; PostgreSQL fixture unavailable locally)
• stable five-interface signature test
• alembic heads (20260810_0005)
• GitHub CI: backend lint/types/tests, backend migrations, frontend lint/types/build, and Vercel checks passed

Scope

This PR contains only the backend application logic behind the five already-merged Agent schedule interfaces. Client calendar reading, cloud snapshot application, WebSocket synchronization, reminder runtime scheduling, GUI editing, and the remaining client-facing interfaces stay out of scope. PostgreSQL candidate-query coverage reuses the existing CI fixture.

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Project	Deployment	Actions	Updated (UTC)
timeflow	Ready	Preview	Aug 11, 2026 10:27am

[fennoai]

Reviewed the fixed range cc39a79...60fdb41. Three correctness issues are annotated inline. CI is green; I also reproduced the ZoneInfo exception class and DST recurrence behavior locally.

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