fix: schedules, restore direct update semantics and strengthen parsin…

[burakdede]

…g tests

This PR fixes the schedule update CLI behavior reported with #167

schedules update argument parsing was semantically wrong due to allow_external_subcommands, so the schedule ID/flags could be parsed unreliably.

• Made schedule_id an explicit required positional arg for update and delete in clap.
• Removed the external-subcommand parsing path.
• Kept direct PUT /schedules/{id_or_name} update behavior with parsed CLI fields.
• Added regression tests to lock parsing behavior and parameter handling.

Possible backend issues still persisting;

1. Missing cron semantic validation on update. Backend accepted and persisted not-a-cron for PUT /schedules/{id}.
2. Potential missing cron validation on create as well. Needs explicit confirmation that create and update enforce the same cron rules.
3. Schedule ID existence is validated, but cron correctness is not, leading to partial/inconsistent contract behavior. I didn't want to introduce client side validation, I believe this is backend-first responsibility.

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