Kinetic Edge Health

Update the Service Pack module to include a configurable number of days field.

• Add a new field in Service Pack:
  ** DurationInDays (Days)
• Modify date calculation logic:
  ** Start Date will be selected manually.
  ** End Date should be auto-calculated based on:
  End Date = Start Date + Number of Days
• If the number of days changes, the End Date should update automatically.