Add Support for Cron Expression Aliases (@daily, @hourly, @weekly, etc.)

[teesofttech]

Description

CronCraft currently does not recognize shorthand cron aliases such as @hourly, @daily, @weekly, @monthly, @yearly, and @reboot. These are widely used in Unix/Linux cron and many scheduling libraries.

Expected Behavior

"@daily".ToHumanReadable(settings);   // → "Every day at 12:00 AM"
"@hourly".ToHumanReadable(settings);  // → "Every hour"
"@weekly".ToHumanReadable(settings);  // → "Every Sunday at 12:00 AM"
"@monthly".ToHumanReadable(settings); // → "Every month on the 1st at 12:00 AM"
"@yearly".ToHumanReadable(settings);  // → "Every year on January 1st at 12:00 AM"
"@reboot".ToHumanReadable(settings);  // → "At system reboot"

Alias Mapping

Alias	Equivalent Cron
@hourly	0 * * * *
@daily	0 0 * * *
@weekly	0 0 * * 0
@monthly	0 0 1 * *
@yearly	0 0 1 1 *
@reboot	(special case)

Where to Look

• CronCraft/Extensions/CronHelper.cs — ConvertQuartzToCronos is a good place to expand with alias normalization before the 5-part parse step.

Acceptance Criteria

• All aliases listed above are recognized and normalized
• @reboot returns a meaningful string (e.g., "At system reboot")
• Unit tests cover each alias
• Localized aliases work in English, Spanish, and French