refactor: centralize QWEN fitment saving via save_qwen_fitment()

- Added save_qwen_fitment() in inventory_vehicle_compat.py to centralize
  inserting QWEN results into inventory_vehicle_compat
- Simplified inventory_bp.py create_item() and auto_match_item_vehicles()
  to use the centralized function, removing duplicated INSERT logic

pos/blueprints/inventory_bp.py

@@ -301,23 +301,13 @@ def create_item():
         if compat_source in ('qwen', 'both'):
             try:
                 from services.qwen_fitment import get_vehicle_fitment
+                from services.inventory_vehicle_compat import save_qwen_fitment
                 fitment = get_vehicle_fitment(
                     data['part_number'],
                     data['name'],
                     data.get('brand', '')
                 )
-                for v in fitment.get('vehicles', []):
-                    if v.get('mye_id'):
-                        cur = conn.cursor()
-                        cur.execute("""
-                            INSERT INTO inventory_vehicle_compat
-                                (inventory_id, model_year_engine_id, source, confidence, created_at)
-                            VALUES (%s, %s, %s, %s, NOW())
-                            ON CONFLICT (inventory_id, model_year_engine_id) DO NOTHING
-                        """, (item_id, v['mye_id'], 'qwen_ai', fitment.get('confidence', 0)))
-                        cur.close()
-                        qwen_added += 1
-                conn.commit()
+                qwen_added = save_qwen_fitment(conn, item_id, fitment)
             except Exception as qwen_err:
                 print(f"[qwen_fitment] Error for item {item_id}: {qwen_err}")
 
@@ -1385,22 +1375,10 @@ def auto_match_item_vehicles(item_id):
     if compat_source == 'qwen':
         try:
             from services.qwen_fitment import get_vehicle_fitment
+            from services.inventory_vehicle_compat import save_qwen_fitment
             fitment = get_vehicle_fitment(part_number, name, brand)
-            # Insert results
-            inserted = 0
-            cur2 = conn.cursor()
-            for v in fitment.get('vehicles', []):
-                if v.get('mye_id'):
-                    cur2.execute("""
-                        INSERT INTO inventory_vehicle_compat
-                            (inventory_id, model_year_engine_id, source, confidence, created_at)
-                        VALUES (%s, %s, %s, %s, NOW())
-                        ON CONFLICT (inventory_id, model_year_engine_id) DO NOTHING
-                    """, (item_id, v['mye_id'], 'qwen_ai', fitment.get('confidence', 0)))
-                    if cur2.rowcount > 0:
-                        inserted += 1
-            conn.commit()
-            cur2.close()
+            inserted = save_qwen_fitment(conn, item_id, fitment)
+            conn.close()
             return jsonify({
                 'matched': inserted > 0,
                 'matches': [],

pos/services/inventory_vehicle_compat.py

@@ -369,3 +369,37 @@ def batch_add_compatibilities(tenant_conn, inventory_id, mye_ids, source='manual
     tenant_conn.commit()
     cur.close()
     return inserted
+
+
+def save_qwen_fitment(tenant_conn, inventory_id, fitment_result):
+    """Save QWEN fitment results into inventory_vehicle_compat.
+
+    Args:
+        tenant_conn: Connection to tenant DB.
+        inventory_id: The inventory item ID.
+        fitment_result: Dict from get_vehicle_fitment() with 'vehicles' list.
+
+    Returns:
+        int: Number of compatibilities inserted.
+    """
+    vehicles = fitment_result.get('vehicles', [])
+    if not vehicles:
+        return 0
+
+    inserted = 0
+    cur = tenant_conn.cursor()
+    for v in vehicles:
+        mye_id = v.get('mye_id')
+        if not mye_id:
+            continue
+        cur.execute("""
+            INSERT INTO inventory_vehicle_compat
+                (inventory_id, model_year_engine_id, source, confidence, created_at)
+            VALUES (%s, %s, 'qwen_ai', %s, NOW())
+            ON CONFLICT (inventory_id, model_year_engine_id) DO NOTHING
+        """, (inventory_id, mye_id, fitment_result.get('confidence', 0)))
+        if cur.rowcount > 0:
+            inserted += 1
+    tenant_conn.commit()
+    cur.close()
+    return inserted