Add endpoint path tests for calendar methods

[TDanks2000]

Background

Calendar methods support all-user and authenticated-user routes with optional startDate, days, and extended values. More path construction tests would make future refactors safer.

Proposed change

Add tests for representative methods such as calendars.allMovies, calendars.allShows, calendars.myMovies, and calendars.mySeasonPremieres.

Acceptance criteria

• Tests verify generated URLs for dated and non-dated calendar calls.
• Tests verify extended is sent as a query parameter.
• Tests do not require live Trakt network access.
• bun run verify passes.

Files likely involved

• tests/endpoints.test.ts
• src/endpoints/calendars.ts