Break up prod import script into pieces and move csv scripts into folder

inventory-server/scripts/import/purchase-orders.js

@@ -1,4 +1,4 @@
-const { updateProgress, outputProgress, formatElapsedTime } = require('./utils');
+const { outputProgress, formatElapsedTime, estimateRemaining, calculateRate } = require('../metrics/utils/progress');
 
 async function importPurchaseOrders(prodConnection, localConnection) {
   outputProgress({
@@ -257,26 +257,32 @@ async function importPurchaseOrders(prodConnection, localConnection) {
         // Update progress based on time interval
         const now = Date.now();
         if (now - lastProgressUpdate >= PROGRESS_INTERVAL || processed === totalItems) {
-          updateProgress(processed, totalItems, "Purchase orders import", startTime);
+          outputProgress({
+            status: "running",
+            operation: "Purchase orders import",
+            current: processed,
+            total: totalItems,
+            elapsed: formatElapsedTime(startTime),
+            remaining: estimateRemaining(startTime, processed, totalItems),
+            rate: calculateRate(startTime, processed)
+          });
           lastProgressUpdate = now;
         }
       }
     }
 
-    const endTime = Date.now();
     outputProgress({
-      operation: `Purchase orders import complete`,
       status: "complete",
-      processed_records: processed,
-      total_records: totalItems,
-      timing: {
-        start_time: new Date(startTime).toISOString(),
-        end_time: new Date(endTime).toISOString(),
-        elapsed_time: formatElapsedTime((endTime - startTime) / 1000),
-        elapsed_seconds: Math.round((endTime - startTime) / 1000)
-      }
+      operation: "Purchase orders import completed",
+      current: totalItems,
+      total: totalItems,
+      duration: formatElapsedTime(Date.now() - startTime),
     });
 
+    return {
+      status: "complete",
+      totalImported: totalItems
+    };
   } catch (error) {
     outputProgress({
       operation: "Purchase orders import failed",