feat: 完整功能迭代 — 移动端+PC端全面优化

新增:
- 今日纪要 (6分类+彩色标签+时间选择器)
- 客户经理PC端工作台 (我的数据,5模块CRUD)
- 用户管理页 (支局长修改角色)
- 客户备注/收支费用(金额+单位)/联系人管理
- 拜访人姓名+电话字段
- 客户导入导出/旧周报导入模板下载
- 序号列+分页(25/50/100)

修复/优化:
- Hash路由→HTML5 History, Casdoor回调正常
- 时区统一为Asia/Shanghai (today_cst)
- 数据库懒加载→selectinload预加载
- 日期解析兼容ISO datetime字符串
- 文件上传定位修复 (position:relative)
- 表单button type='button'防止误提交
- 分管领导权限(只读客户档案,不可编辑)
- 侧边栏折叠+SVG图标
- 拜访方式/紧急度统一chip风格
- 时间范围统一为el-time-picker(is-range)
- 全局CSS设计变量+box-sizing修复滚动条

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

frontend/src/views/Login.vue

@@ -92,14 +92,29 @@ function goCasdoorLogin() {
   justify-content: center;
   align-items: center;
   height: 100vh;
-  background: linear-gradient(135deg, #1a73e8 0%, #4080ff 50%, #69a0ff 100%);
+  background: linear-gradient(135deg, #4f6ef7 0%, #7b93fa 40%, #a5b4fc 100%);
+  position: relative;
+  overflow: hidden;
+}
+.login-page::before {
+  content: ''; position: absolute; width: 600px; height: 600px;
+  background: rgba(255,255,255,0.05); border-radius: 50%;
+  top: -200px; right: -200px;
+}
+.login-page::after {
+  content: ''; position: absolute; width: 400px; height: 400px;
+  background: rgba(255,255,255,0.04); border-radius: 50%;
+  bottom: -100px; left: -100px;
 }
 .login-card {
   background: white;
-  border-radius: 16px;
+  border-radius: 20px;
   padding: 48px 40px;
-  width: 360px;
-  box-shadow: 0 20px 60px rgba(0,0,0,0.2);
+  width: 380px;
+  max-width: 90vw;
+  box-shadow: 0 25px 60px rgba(0,0,0,0.15);
+  position: relative;
+  z-index: 1;
 }
 .brand {
   text-align: center;
@@ -107,18 +122,24 @@ function goCasdoorLogin() {
 }
 .brand h1 {
   margin: 0;
-  font-size: 32px;
-  color: #1a73e8;
+  font-size: 36px;
+  font-weight: 800;
+  letter-spacing: 4px;
+  background: linear-gradient(135deg, #4f6ef7, #7b93fa);
+  -webkit-background-clip: text;
+  -webkit-text-fill-color: transparent;
+  background-clip: text;
 }
 .brand p {
-  margin: 8px 0 0;
-  color: #909399;
+  margin: 10px 0 0;
+  color: var(--c-text-secondary);
   font-size: 14px;
+  letter-spacing: 1px;
 }
 .hint {
   text-align: center;
-  color: #c0c4cc;
+  color: var(--c-text-muted);
   font-size: 12px;
-  margin-top: 16px;
+  margin-top: 20px;
 }
 </style>