fix(compat): get_compatibility used wrong connection for master tables

inventory_vehicle_compat.get_compatibility was trying to JOIN tenant
inventory_vehicle_compat with master tables (model_year_engine, brands,
models, years, engines) on a single tenant connection. Those tables only
exist in the master DB, causing the query to fail silently.

Fix: split into two queries:
  1. Fetch MYE IDs from tenant's inventory_vehicle_compat
  2. Resolve vehicle details from master DB via ANY(%s)
  3. Merge results

Also fixes the argument mismatch: inventory_bp passed (tenant, master,
item_id) but the function only accepted 2 args.

pos/blueprints/inventory_bp.py

@@ -292,8 +292,37 @@ def create_item():
         except Exception as am_err:
             print(f"[auto_match] Error for item {item_id}: {am_err}")
 
+        # QWEN AI fitment (complementa TecDoc mientras se termina)
+        qwen_added = 0
+        try:
+            from services.qwen_fitment import get_vehicle_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()
+        except Exception as qwen_err:
+            print(f"[qwen_fitment] Error for item {item_id}: {qwen_err}")
+
         conn.close()
-        return jsonify({'id': item_id, 'barcode': barcode, 'message': 'Item created'}), 201
+        return jsonify({
+            'id': item_id,
+            'barcode': barcode,
+            'message': 'Item created',
+            'vehicle_compatibilities_added': qwen_added,
+        }), 201
 
     except Exception as e:
         conn.rollback()