refactor: 确保舱单编辑页保存时始终传递 no 和 prefix 参数

重构 GjjManifestAddViewModel 的参数构建方式：
- 改用 mutableMapOf 手动处理可选字段，替代 removeEmptyOrNull = true
- 编辑模式下 mfId、no、prefix 单独追加，不受空字符串过滤影响

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

module_gjj/src/main/java/com/lukouguoji/gjj/viewModel/GjjManifestAddViewModel.kt

@@ -373,11 +373,10 @@ class GjjManifestAddViewModel : BaseViewModel() {
             return
         }
 
-        val params = mapOf(
-            "mfId" to if (pageType.value == DetailsPageType.Modify) mfId else null,
+        val isModify = pageType.value == DetailsPageType.Modify
+
+        val paramsMap = mutableMapOf<String, Any?>(
             "fid" to fid,
-            "no" to if (pageType.value == DetailsPageType.Modify) no else null,
-            "prefix" to if (pageType.value == DetailsPageType.Modify) prefix else null,
             "wbNo" to waybillNo.value,
             "agentCode" to agent.value,
             "spCode" to specialCode.value.let { if (it.isNullOrEmpty()) "NOR" else it },
@@ -386,19 +385,30 @@ class GjjManifestAddViewModel : BaseViewModel() {
             "pc" to actualNum.value,
             "weight" to actualWeight.value,
             "cashWeight" to billingWeight.value,
-            "packageType" to packageType.value,
             "origin" to departure.value,
             "dest" to destination.value,
             "goods" to goodsNameEn.value,
             "goodsCn" to goodsNameCn.value,
             "awbType" to waybillType.value,
-            "cargoType" to goodsType.value,
-            "unNumber" to unNumber.value,
-            "remark" to remark.value,
-        ).toRequestBody(removeEmptyOrNull = true)
+        )
+
+        // 可选字段：非空时才传
+        if (!packageType.value.isNullOrEmpty()) paramsMap["packageType"] = packageType.value
+        if (!goodsType.value.isNullOrEmpty()) paramsMap["cargoType"] = goodsType.value
+        if (!unNumber.value.isNullOrEmpty()) paramsMap["unNumber"] = unNumber.value
+        if (!remark.value.isNullOrEmpty()) paramsMap["remark"] = remark.value
+
+        // 编辑模式：必须传 mfId、no、prefix（不受空字符串过滤影响）
+        if (isModify) {
+            paramsMap["mfId"] = mfId
+            paramsMap["no"] = no
+            paramsMap["prefix"] = prefix
+        }
+
+        val params = paramsMap.toRequestBody()
 
         launchLoadingCollect({
-            if (pageType.value == DetailsPageType.Modify) {
+            if (isModify) {
                 NetApply.api.gjjManifestUpdate(params)
             } else {
                 NetApply.api.gjjManifestInsert(params)
@@ -406,7 +416,7 @@ class GjjManifestAddViewModel : BaseViewModel() {
         }) {
             onSuccess = {
                 if (it.verifySuccess()) {
-                    val successMsg = if (pageType.value == DetailsPageType.Modify) "修改成功" else "保存成功"
+                    val successMsg = if (isModify) "修改成功" else "保存成功"
                     showToast(successMsg)
 
                     // 发送刷新事件