Start fixing forecast service API 5

tests/test_onboarding_flow.sh

@@ -572,13 +572,16 @@ log_step "5.1. Testing basic dashboard functionality"
 # Use a real product name from our CSV for forecasting
 FIRST_PRODUCT=$(echo "$REAL_PRODUCTS" | sed 's/"//g' | cut -d',' -f1)
     
-FORECAST_RESPONSE=$(curl -s -X POST "$API_BASE/api/v1/tenants/$TENANT_ID/forecast/single" \
+FORECAST_RESPONSE=$(curl -s -X POST "$API_BASE/api/v1/tenants/$TENANT_ID/forecasts/single" \
     -H "Content-Type: application/json" \
     -H "Authorization: Bearer $ACCESS_TOKEN" \
     -d "{
-        \"products\": [\"$FIRST_PRODUCT\"],
-        \"forecast_days\": 7,
-        \"date\": \"2025-09-15\"
+        \"product_name\": [\"$FIRST_PRODUCT\"],
+        \"forecast_date\": "2025-11-30",
+        \"forecast_days\": 1,
+        \"date\": \"2025-09-15\",
+        \"location\": \"madrid_centro\",
+        \"confidence_level\": 0.85
         }")
     
 if echo "$FORECAST_RESPONSE" | grep -q '"predictions"\|"forecast"'; then