feat(cron): migrate from robfig/cron/v3 to hyp3rd/cron/v4

[hyp3rd]

Replace the github.com/robfig/cron/v3 dependency with the internal github.com/hyp3rd/cron/v4 fork across all cron-related files.

Key changes:

• Switch all cron entry scheduling to scheduleCronEntry, which wraps the new ScheduleNamed API to associate a name with each entry, enabling direct name resolution in AdminSchedules without requiring a reverse-lookup map fallback.
• Update cronJob signature from func() to func(context.Context) error to align with the new FuncJob interface, and propagate the job's context through to runDurableCron and runInMemoryCron.
• Update skipCronTick to also check the job-provided context in addition to the TaskManager's own context.
• Replace cron.NewParser with cron.NewSpecParser throughout.
• Pass context to cron.Start and handle the error returned by cron.Stop, ignoring expected cancellation errors.
• Update go.mod and go.sum accordingly.

[Copilot]

Pull request overview

Migrates the worker scheduler from github.com/robfig/cron/v3 to the internal fork github.com/hyp3rd/cron/v4, updating scheduling and lifecycle handling to match the new API and improving schedule name resolution in admin views.

Changes:

• Replace Schedule with ScheduleNamed via a scheduleCronEntry helper and use entry.Name in AdminSchedules (with map fallback).
• Update cron job execution to accept a context.Context (and propagate it into task factories / registrations); extend skipCronTick to consider the job context.
• Switch parsers to NewSpecParser, pass context into cron.Start, and handle errors from cron.Stop; update go.mod/go.sum and imports accordingly.

Reviewed changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
worker.go	Swap cron dependency import to github.com/hyp3rd/cron/v4.
cron.go	Core migration: ScheduleNamed wrapper, context-aware cron jobs, parser + Start/Stop API updates.
admin_taskmanager.go	Prefer entry.Name for schedule listing; use scheduleCronEntry when creating schedules.
go.mod	Replace robfig/cron/v3 with hyp3rd/cron/v4.
go.sum	Add checksums for hyp3rd/cron/v4 and remove robfig/cron/v3.

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