Add Timeclock settings tab in Company Settings with multi-kiosk support

Settings tab (Company Settings > Timeclock):
- Enable/disable timeclock toggle (hides nav link and attendance report when off)
- Allow multiple clock-ins per day toggle
- Auto clock-out after X hours (auto-closes forgotten open entries on next punch)
- Kiosk devices table: lists activated tablets with name, activated date, last seen;
  Deactivate button removes that device's access immediately

Multi-kiosk support (replaces single TimeclockKioskToken on Company):
- New TimeclockKioskDevice entity (one row per tablet, unique token, DeviceName, LastSeenAt)
- KioskActivate GET shows a form for optional device name before activating
- KioskDeactivate POST accepts device ID, deletes specific row (not all devices)
- Kiosk validation (Kiosk, KioskEmployees, KioskPunch) queries device table with
  ignoreQueryFilters since no user is logged in on kiosk requests
- LastSeenAt updated on each Kiosk page load

Enforcement:
- ClockIn and KioskPunch both auto-close stale entries if AutoClockOutHours is set
- ClockIn and KioskPunch both block second same-day punch if AllowMultiplePunches=false
- TimeclockEnabled=false hides nav link (SubscriptionMiddleware sets Items key) and
  returns Forbid on kiosk punch
- Migration: AddTimeclockSettings (adds 3 columns to Companies, new TimeclockKioskDevices table)

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

src/PowderCoating.Web/Middleware/SubscriptionMiddleware.cs

@@ -97,6 +97,7 @@ public class SubscriptionMiddleware
             context.Items["AllowAccounting"]      = true;
             context.Items["AllowSms"]             = true;
             context.Items["AllowCustomFormulas"]  = true;
+            context.Items["TimeclockEnabled"]     = true;
             await _next(context);
             return;
         }
@@ -148,6 +149,7 @@ public class SubscriptionMiddleware
                 || (!company.SmsDisabledByAdmin && (planConfig?.AllowSms ?? false) && company.SmsEnabled);
             context.Items["AllowCustomFormulas"] = company.IsComped
                 || (planConfig?.AllowCustomFormulas ?? false);
+            context.Items["TimeclockEnabled"]    = company.TimeclockEnabled;
 
             if (company.IsComped)
             {