fix(theme): 修 hover 颜色不正确 - 干掉硬编码老蓝 + fallback 双重失效

核心问题 (按影响面排序):

1. Login.vue: login-btn hover 是硬编码 Tailwind blue-800 #1e40af
   跟主色 #007A95 青蓝完全不同色系, hover 突变
   - 改成 var(--brand-primary-deep) (#004858 暗青蓝)

2. 14 个页面写了 :deep(.el-button--primary:hover) { background:
   var(--brand-primary-deep, var(--brand-primary)) } — 第二参数
   fallback 让 hover 退化成主色 (不变深), 视觉上'按钮没反应'
   - 删第二参数, 直接 var(--brand-primary-deep)

3. AdminLayout: 菜单激活背景硬编码 #1890ff (Ant 老蓝),
   跟青蓝主题对比突兀
   - 改成 var(--brand-primary)

4. 17 处 .breadcrumb a:hover / .hint-link:hover / el-button.is-link:hover
   同样 fallback 双重失效问题, 删 fallback

5. 其余硬编码老蓝 (#1890ff / #409eff) 在:
   - OssFileUploader / OssImageUploader / IdCardUploader (upload hover border)
   - Login.vue (modal-btn, accent-color, user-type-item hover)
   - doctor/Account.vue (breadcrumb link, 章节左边竖线)
   - ManagerProjectsAssign.vue (合同链接)
   - PublicityDetail.vue (ann-menu hover)
   全部换成 var(--brand-primary) / var(--brand-primary-deep)

6. 修 PublicityDetail.vue 注释错误:
   原: // 深色用品牌主色 (#1890ff), ...
   正: 二维码 dark 是 #1f2937 (深灰), 不是主色

总计 24 个文件
grep '#1890ff|#409eff|#096dd9|#0050b3|#1e40af|#1d4ed8' 已 0 命中

ry-vue3/src/components/OssFileUploader.vue

@@ -150,7 +150,7 @@ function onRemove() {
   transition: border-color 0.2s;
   min-height: 60px;
 }
-.ht-file-upload:hover { border-color: #1890ff; }
+.ht-file-upload:hover { border-color: var(--brand-primary); }
 .ht-file-upload.has-file { border-style: solid; border-color: #52c41a; background: #fff; }
 .ht-file-upload.is-block { width: 100%; }
 .ht-file-upload.readonly { cursor: default; }
@@ -167,14 +167,14 @@ function onRemove() {
 .ht-file-info {
   display: flex; align-items: center; gap: 12px; flex: 1; min-width: 0;
 }
-.file-icon { color: #1890ff; flex-shrink: 0; }
+.file-icon { color: var(--brand-primary); flex-shrink: 0; }
 .file-meta { flex: 1; min-width: 0; display: flex; flex-direction: column; gap: 2px; }
 .file-name {
   font-size: 14px; color: #1a1a1a; font-weight: 500;
   overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
   cursor: pointer;
 }
-.file-name:hover { color: #1890ff; text-decoration: underline; }
+.file-name:hover { color: var(--brand-primary); text-decoration: underline; }
 .file-type { font-size: 12px; color: #909399; }
 .remove-btn { flex-shrink: 0; }