Fix template variable interpolation issues in dashboard

This commit fixes the template interpolation issues where variables like
{{supplier_name}}, {{product_names_joined}}, {{current_stock}}, etc. were
showing as literal strings instead of being replaced with actual values.

Changes made:

1. **Dashboard Service (Orchestrator):**
   - Added missing `current_stock` parameter to default reasoning_data for
     production batches
   - This ensures all required template variables are present when batches
     don't have proper reasoning_data from the database

2. **Production Service:**
   - Updated batch creation to properly populate `product_name` field
   - Improved product name resolution to check forecast data and stock_info
     before falling back to placeholder
   - Added missing `product_id` field to batch_data
   - Added required `planned_duration_minutes` field to batch_data
   - Ensures reasoning_data has all required parameters (product_name,
     predicted_demand, current_stock, confidence_score)

The root cause was that the default reasoning_data used by the dashboard
service when database records lacked proper reasoning_data was missing
required parameters. This resulted in i18n template variables being
displayed as literal {{variable}} strings instead of interpolated values.

Fixes dashboard display issues for:
- Purchase order cards showing {{supplier_name}}, {{product_names_joined}},
  {{days_until_stockout}}
- Production plan items showing {{product_name}}, {{predicted_demand}},
  {{current_stock}}, {{confidence_score}}

services/orchestrator/app/services/dashboard_service.py

@@ -602,6 +602,7 @@ class DashboardService:
                 "parameters": {
                     "product_name": batch.get("product_name", "Product"),
                     "predicted_demand": batch.get("planned_quantity", 0),
+                    "current_stock": 0,  # Default to 0 if not available
                     "confidence_score": 85
                 }
             }