Fix orchestration saga failure due to schema mismatch and missing pandas

Root Causes Fixed:
1. BatchForecastResponse schema mismatch in forecasting service
   - Changed 'batch_id' to 'id' (required field name)
   - Changed 'products_processed' to 'total_products'
   - Changed 'success' to 'status' with "completed" value
   - Changed 'message' to 'error_message'
   - Added all required fields: batch_name, completed_products, failed_products,
     requested_at, completed_at, processing_time_ms, forecasts
   - This was causing "11 validation errors for BatchForecastResponse"
     which made the forecast service return None, triggering saga failure

2. Missing pandas dependency in orchestrator service
   - Added pandas==2.2.2 and numpy==1.26.4 to requirements.txt
   - Fixes "No module named 'pandas'" warning when loading AI enhancement

These issues prevented the orchestrator from completing Step 3 (generate_forecasts)
in the daily workflow, causing the entire saga to fail and compensate.

services/forecasting/app/api/forecasting_operations.py

@@ -242,13 +242,20 @@ async def generate_batch_forecast(
             if not inventory_product_ids:
                 logger.info("No products found for forecasting", tenant_id=tenant_id)
                 from app.schemas.forecasts import BatchForecastResponse
+                now = datetime.now(timezone.utc)
                 return BatchForecastResponse(
-                    batch_id=str(uuid.uuid4()),
+                    id=str(uuid.uuid4()),
                     tenant_id=tenant_id,
-                    products_processed=0,
-                    forecasts_generated=0,
-                    success=True,
-                    message="No products found for forecasting"
+                    batch_name=getattr(request, 'batch_name', f"orchestrator-batch-{datetime.now().strftime('%Y%m%d')}"),
+                    status="completed",
+                    total_products=0,
+                    completed_products=0,
+                    failed_products=0,
+                    requested_at=now,
+                    completed_at=now,
+                    processing_time_ms=0,
+                    forecasts=None,
+                    error_message=None
                 )
 
         # Skip rate limiting for service-to-service calls (orchestrator)