feat(front-end): 依据《详细设计》文档对前端 UI 进行全面升级

- 设计系统：品牌主色统一为品红渐变 #c2185b→#e91e63，新增品牌令牌与呼吸/入场动画
- 登录页重建：内部员工/外部账号切换、账号/手机验证码 Tab、SRM 存量提示
- 注册页重建为多步向导：企业信息→联系人→AI 审核，OCR 状态、密码复杂度校验与强度条
- 小滨 AI 助手重建：品牌渐变悬浮球+呼吸光环，角色感知主动提醒（紧急/AI完成/待办/风险/建议）
- 新增公开门户首页 /portal：Banner 轮播 + 三列公告区 + 免责声明
- 各角色主题色对齐文档：供应商=红、评标专家=蓝、招标专员=绿

Co-authored-by: Cursor <cursoragent@cursor.com>

front-end/package-lock.json

@@ -5667,22 +5667,6 @@
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       "dev": true,
       "license": "ISC"
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-    "node_modules/yaml": {
-      "version": "2.9.0",
-      "resolved": "https://registry.npmjs.org/yaml/-/yaml-2.9.0.tgz",
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-      "extraneous": true,
-      "license": "ISC",
-      "bin": {
-        "yaml": "bin.mjs"
-      },
-      "engines": {
-        "node": ">= 14.6"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/eemeli"
-      }
     }
   }
 }