Demo seed Phase 2: workers, time entries, maintenance records

- 5 named shop workers seeded as ApplicationUser (Employee role):
  Mike Sanders (Coater), Jake Wilson (Sandblaster), Sarah Brooks (Inspector),
  Tyler Green (General), Chris Mason (Lead) — @pcldemo.com fingerprint domain
- Job time entries seeded for all in-progress and completed jobs;
  Worker Productivity report will have data from day one
- Maintenance history seeded per equipment: 2 completed records + 1 upcoming
  scheduled + 1 overdue record on Pressure Pot for overdue alert demo
- Equipment renamed to spec names: Main Batch Oven, Small Batch Oven, Powder
  Coating Booth, Blast Cabinet, Pressure Pot Blaster, Air Compressor, Wash
  Station, Forklift (replaced Overhead Conveyor which wasn't in spec)
- RemoveSeedDataOptions.Workers added; Remove.cs cleans up workers + time
  entries on Demo Reset; SeedDataController resets workers in ResetDemoCompany

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/PowderCoating.Application/Interfaces/ISeedDataService.cs

@@ -47,6 +47,7 @@ public class RemoveSeedDataOptions
     public bool OperatingCosts { get; set; }
     public bool Bills { get; set; }
     public bool Expenses { get; set; }
+    public bool Workers { get; set; }
 }
 
 public class SeedDataResult