修复：完善业务页面异步与扫码状态

shierfeng-fastapi-frontend/src/views/business/filling/index.vue

@@ -339,8 +339,7 @@ function handleFillingScan(qrToken) {
   if (operationPending.value || scanLoading.value) return
   clearFillingIdempotencyKey()
   scannedPallet.value = null
-  form.value.qrToken = ''
-  form.value.warehouseId = undefined
+  form.value = { qrToken: '', warehouseId: undefined, strainId: undefined, batchNo: '', packageSpec: '', initialPackages: undefined }
   const scanContext = { generation: ++scanGeneration, dialogSession, qrToken }
   scanLoading.value = true
   scanError.value = ''
@@ -372,8 +371,7 @@ function handleFillingScan(qrToken) {
 function handleScanInvalid(message) {
   clearFillingIdempotencyKey()
   scannedPallet.value = null
-  form.value.qrToken = ''
-  form.value.warehouseId = undefined
+  form.value = { qrToken: '', warehouseId: undefined, strainId: undefined, batchNo: '', packageSpec: '', initialPackages: undefined }
   scanError.value = message
 }