feat: 历史周报+图片预览+照片管理+导入优化+用户合并

新增:
- 历史周报: Dashboard/周报详情支持周选择器翻看往周，归档只读
- 图片预览: 全屏大图(移动端+PC端)，点击遮罩关闭
- PC端照片管理: 编辑时可上传/删除照片
- 客户导入改为更新模式: 重名自动更新信息，显示操作明细
- 导入跳过原因: 旧周报导入也显示每条跳过原因

优化:
- 填报进度权限: 经理只看到自己，支局长/领导看全员
- 客户经理暖灰色hash标签列
- 用户去重合并(4组)，数据完整迁移
- CLAUDE.md 更新到最新状态

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

frontend/src/views/mobile/Home.vue

@@ -11,6 +11,8 @@ const todayVisitCount = ref(0)
 const visits = ref<any[]>([])
 const todayNoteCount = ref(0)
 const dailyNotes = ref<any[]>([])
+const previewImageUrl = ref('')
+const previewDialogVisible = ref(false)
 const photoUrls = ref<Record<string, string>>({})
 const loading = ref(false)
 
@@ -52,6 +54,8 @@ async function loadToday() {
   } finally { loading.value = false }
 }
 
+function previewPhoto(url: string) { previewImageUrl.value = url; previewDialogVisible.value = true }
+
 onMounted(loadToday)
 </script>
 
@@ -174,7 +178,7 @@ onMounted(loadToday)
               <span class="demand-marker">◆</span> {{ v.customer_demand }}
             </p>
             <div v-if="v.photos?.length" class="record-photos">
-              <img v-for="key in v.photos" :key="key" :src="photoUrls[key] || ''" class="record-photo" />
+              <img v-for="key in v.photos" :key="key" :src="photoUrls[key] || ''" class="record-photo" @click.stop="previewPhoto(photoUrls[key])" />
             </div>
             <div class="record-footer" v-if="v.time_range">
               <span class="record-time">{{ v.time_range }}</span>
@@ -190,6 +194,13 @@ onMounted(loadToday)
         <p class="empty-hint">点击上方按钮开始填报</p>
       </div>
     </div>
+
+    <teleport to="body">
+      <div v-if="previewDialogVisible" class="image-preview-overlay" @click="previewDialogVisible = false">
+        <img :src="previewImageUrl" class="image-preview-full" @click.stop />
+        <button class="image-preview-close" @click="previewDialogVisible = false">✕</button>
+      </div>
+    </teleport>
   </div>
 </template>