Commit remaining unstaged changes from this session

- Platform settings service: IPlatformSettingsService, PlatformSettingKeys,
  PlatformSettingsService, SubscriptionService, AppConstants,
  SubscriptionExpiryBackgroundService, SubscriptionMiddleware
- JobTimeEntry entity, DTOs, AutoMapper profile (ShopWorker → UserId migration)
- InventoryDtos: SourceTransactionId on PowderUsageLogDto
- InventoryTransactionRepository: include Job.Customer in ledger query
- InventoryAiLookupService: @graph unwrap + HTML price fallback
- ApplicationDbContextModelSnapshot: reflect migration changes
- launchSettings.json, publish profile

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

src/PowderCoating.Application/Interfaces/IPlatformSettingsService.cs

@@ -6,6 +6,7 @@ public interface IPlatformSettingsService
 {
     Task<string?> GetAsync(string key);
     Task<bool> GetBoolAsync(string key, bool defaultValue = false);
+    Task<int> GetIntAsync(string key, int defaultValue);
     Task SetAsync(string key, string? value, string? updatedBy = null);
     Task<IReadOnlyList<PlatformSetting>> GetAllAsync();
 }