feat(pl): hard-block over-limit contract qty on arrange and remind after success

Validate arranged+this plan qty against fixed contract product quantities on
transport arrange; return post-success remaining/framework cumulative reminders.

Co-authored-by: Cursor <cursoragent@cursor.com>

web-admin/src/components/business/pl-plan-form-dialog/index.vue

@@ -251,6 +251,7 @@
           <el-icon><Close /></el-icon>取消
         </el-button>
         <el-button
+          v-if="showSaveButton"
           :type="showSaveAndArrangeButton ? 'default' : 'primary'"
           :class="showSaveAndArrangeButton ? 'btn-ghost' : undefined"
           :loading="submitLoading"
@@ -481,6 +482,8 @@
   const loadedPlanSnapshot = ref<Plan | null>(null)
   const selectedDriverId = ref('')
 
+  /** 已安排：禁止仅「保存」，须走保存并安排/调整运输，避免计划与地磅等联动字段脱节 */
+  const showSaveButton = computed(() => loadedTransportStatus.value !== 'arranged')
   const showSaveAndArrangeButton = computed(() => {
     if (!isEdit.value) return true
     if (props.openForArrange && loadedTransportStatus.value === 'arranged') return false
@@ -1438,7 +1441,11 @@
       getUnitLabel
     })
 
-    await submitPlanArrange(planId, payload)
+    try {
+      await submitPlanArrange(planId, payload)
+    } catch {
+      return false
+    }
     ElMessage.success(isRearrange ? '运输调整成功' : '运输安排成功')
     innerVisible.value = false
     emit('success', { planId, arranged: true })