fix: 协同拜访副本判断 — 主记录不再被误判为副本

- 原逻辑: 只要 visit_group_id 存在就当副本,导致主记录被误判
- 且用 companions[0](第一个同访人)当作创建者,显示错误的协同人
- 新逻辑: 用 edit_log[0].editor 判断 — editor==归属经理 是主记录, editor!=归属经理 才是副本
- 副本提示的创建者改为 edit_log[0].editor,不再依赖 companions[0]

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

frontend/src/views/mobile/VisitForm.vue

@@ -81,15 +81,16 @@ onMounted(async () => {
         const parts = v.time_range.split('-')
         timeRangeValue.value = [parts[0], parts[1]]
       }
-      // Check if this is a companion record
-      if (v.visit_group_id) {
+      // Check if this is a companion copy (a record created BY someone else
+      // and copied to you as a co-visitor). The original (主记录) has
+      // editor == manager; a copy has editor != manager.
+      const creatorName = (v.edit_log && v.edit_log[0] && v.edit_log[0].editor) || ''
+      if (v.visit_group_id && creatorName && creatorName !== (v.manager_name || '')) {
         isCompanionRecord.value = true
-        // The companions field on a companion record contains the primary creator
-        const creatorId = (v.companions || [])[0]
-        if (creatorId) {
-          const creator = managers.value.find((m: any) => m.id === String(creatorId))
-          companionOf.value = creator?.name || ''
-        }
+        companionOf.value = creatorName
+      } else {
+        isCompanionRecord.value = false
+        companionOf.value = ''
       }
       for (const key of (v.photos || [])) {
         try {