feat: 导入增强 + 客户合并 + 同伴自定义 + 性能优化

=== 导入系统全面增强 ===
- 5 Sheet 完整导入：拜访/计划/商机/要客/纪要
- 同访人智能解析：中英文逗号/顿号/分号 → 系统用户UUID + 外部人员TEXT
- 客户自动创建：Excel中不存在的客户自动入库
- 模糊名称匹配：去空格 + 包含关系纠错
- manager_id 修正：导入时用客户分配的经理（非Excel列/非导入人）
- 模板更新：Sheet5「客户经理」→「填报人」，同访人示例含逗号分隔

=== 客户合并功能 ===
- PUT 改名碰撞检测 → 409 + 合并预览
- GET merge-preview / POST merge 端点
- 事务级迁移：Visit/WorkPlan/MiniBusiness/KeyVisit/联系人/分配
- 去重逻辑：联系人(name+phone)、分配(manager+role)
- last_visit_date 取最大值

=== 拜访记录完善 ===
- visits 新增 companion_names TEXT[] 列
- 同访人支持自定义输入（外部人员），el-select allow-create
- 移动端 VisitForm + PC端 ManagerWorkspace 统一
- 周报「客户经理」→「相关人员」（创建人+同访人）
- 纪要「客户经理」→「填报人」
- 删除拜访后重新计算 customer.last_visit_date

=== 客户选择放开 ===
- 客户经理可看到全部客户（不再限自己分配的）
- 拜访时客户下拉返回全量

=== 前端性能优化 ===
- Element Plus 按需加载 (unplugin-vue-components + unplugin-element-plus)
- 周报照片URL并行请求 (Promise.all)
- onMounted 三路并行 (loadReport + dropdowns + AI)
- nginx Cache-Control: immutable for /assets/
- Google Fonts preconnect hints
- 图片上传前 Canvas 压缩 (max 1920px, quality 0.8)

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

frontend/src/components.d.ts

@@ -0,0 +1,52 @@
+/* eslint-disable */
+// @ts-nocheck
+// biome-ignore lint: disable
+// oxlint-disable
+// ------
+// Generated by unplugin-vue-components
+// Read more: https://github.com/vuejs/core/pull/3399
+
+export {}
+
+/* prettier-ignore */
+declare module 'vue' {
+  export interface GlobalComponents {
+    DesktopLayout: typeof import('./components/DesktopLayout.vue')['default']
+    EditLogPanel: typeof import('./components/EditLogPanel.vue')['default']
+    ElAlert: typeof import('element-plus/es')['ElAlert']
+    ElButton: typeof import('element-plus/es')['ElButton']
+    ElCard: typeof import('element-plus/es')['ElCard']
+    ElCol: typeof import('element-plus/es')['ElCol']
+    ElCollapse: typeof import('element-plus/es')['ElCollapse']
+    ElCollapseItem: typeof import('element-plus/es')['ElCollapseItem']
+    ElConfigProvider: typeof import('element-plus/es')['ElConfigProvider']
+    ElDatePicker: typeof import('element-plus/es')['ElDatePicker']
+    ElDescriptions: typeof import('element-plus/es')['ElDescriptions']
+    ElDescriptionsItem: typeof import('element-plus/es')['ElDescriptionsItem']
+    ElDialog: typeof import('element-plus/es')['ElDialog']
+    ElForm: typeof import('element-plus/es')['ElForm']
+    ElFormItem: typeof import('element-plus/es')['ElFormItem']
+    ElInput: typeof import('element-plus/es')['ElInput']
+    ElLink: typeof import('element-plus/es')['ElLink']
+    ElOption: typeof import('element-plus/es')['ElOption']
+    ElPagination: typeof import('element-plus/es')['ElPagination']
+    ElProgress: typeof import('element-plus/es')['ElProgress']
+    ElRow: typeof import('element-plus/es')['ElRow']
+    ElSelect: typeof import('element-plus/es')['ElSelect']
+    ElSwitch: typeof import('element-plus/es')['ElSwitch']
+    ElTable: typeof import('element-plus/es')['ElTable']
+    ElTableColumn: typeof import('element-plus/es')['ElTableColumn']
+    ElTabPane: typeof import('element-plus/es')['ElTabPane']
+    ElTabs: typeof import('element-plus/es')['ElTabs']
+    ElTag: typeof import('element-plus/es')['ElTag']
+    ElTimePicker: typeof import('element-plus/es')['ElTimePicker']
+    ElTooltip: typeof import('element-plus/es')['ElTooltip']
+    ImagePreview: typeof import('./components/ImagePreview.vue')['default']
+    MobileLayout: typeof import('./components/MobileLayout.vue')['default']
+    RouterLink: typeof import('vue-router')['RouterLink']
+    RouterView: typeof import('vue-router')['RouterView']
+  }
+  export interface GlobalDirectives {
+    vLoading: typeof import('element-plus/es')['ElLoadingDirective']
+  }
+}