aisman

Session 154, Step 1: Fix Wf S4 credit tracking UI not rendering (remaining credit + provider dropdown missing)
- AIM-2851 Fix Wf S4 credit tracking UI not rendering (remaining credit + provider dropdown missing)
- AIM-2852 Add OrgId column to AiCreditProvider model, context, and CRUD endpoints
- AIM-2853 Rename AiCreditProviderPurchase columns and add AiCPPurchaseTypeId FK
- AIM-2854 Add AiCreditProviderCreditRemaining column to AiCreditProvider table
- AIM-2855 Create AiCreditProviderPurchaseType table, model, and context
- AIM-2856 Update 'Add purchase' dialog with purchase type dropdown, pre-population, and new styling
- AIM-2857 Filter 'Manage credit providers' dialog to show only purchases with remaining credit > 0
- AIM-2858 Update Wf S4 dropdown to show provider name with dynamic per-unit rate
- AIM-2859 Implement FIFO credit consumption logic in _processS4TaskWithCredit
- AIM-2860 Implement 'Update remaining credit' button with manual adjustment and FIFO subtraction

Outcome:
Completed full refactor of AI credit tracking system. Updated SQL schema (3 tables), C# models (3 files), DbContext, WorkflowController CRUD endpoints (provider, purchase, purchase type, FIFO consume, adjust-credit), and JavaScript UI (dropdown, dialogs, FIFO consumption, update remaining credit button).