Add schedule commands to the CLI

[patrikbraborec]

Problem

Schedules can only be managed in Apify Console. Neither the CLI nor the MCP server exposes them, so a scripted or agent-driven workflow can create, push, and run an Actor, but cannot put it on a schedule without a human opening Console.

What we want

An apify schedules command group covering schedule CRUD.

Requirements

P0

• List schedules with their cron expression, timezone, and enabled state.
• Create a schedule for an Actor or a task, with cron expression and timezone.
• Delete a schedule.

P1

• Update an existing schedule.
• Enable and disable a schedule.
• --json output for scripting.

Open questions

• Do schedules belong in the project config (declared in a file, applied on push), or flags only?
• Same surface in the MCP server, or CLI first?

Links

• Related: Deploy Actor source code using MCP apify-mcp-server#1217 covers deploying Actor source over MCP, not schedules.