Align console UI with school-iot-admin and wire login to serverschool

UI / layout
- rebuild left mode: full-width blue header (60px) + white sidebar below + card-style tags view
- introduce design tokens in variables.css (brand #347df9, sidebar 240px, menu item 49px)
  and theme overrides for dark / dark-blue themes
- restyle navigation bar (logo + platform name / top nav / tools + user), logo, sidebar
  (selected state: light blue bg + blue bar + bold), tags view, app main
- global styles: .app-container white card, .head-title, .btn-blue/.btn-white,
  el-table / el-dialog look, brand color injected into --el-color-primary
- add favorites store (localStorage) wired to sidebar star and header top nav
- disable template watermark / footer / promo notifications by default

Login (serverschool)
- port school-iot-admin login page (background art, right side card, keep-login)
- OAuth2 password mode: GET /oauth/token (raw axios) + GET /uc/account/current
- port phone lookup (/wx/getAccoutList) and forget-password flow
  (/sms/sendCode + /sms/verifyCode) as components/login/Forget.vue
- user store exposes accountInfo / accountType / teamId / roleId and strips password

Infra
- move all devServer proxies and env vars from school-iot-admin/vue.config.js
  (default targets point to production)
- fix empty sidebar: guard short-circuit skipped setRoutes when login page already
  fetched user info

src/common/assets/styles/index.scss

@@ -16,8 +16,58 @@
 @import "./view-transition.scss";
 
 // 业务页面几乎都应该在根元素上挂载 class="app-container"，以保持页面美观
+// 视觉规范对齐 school-iot-admin：白卡片 + 10px 圆角 + 淡蓝阴影
 .app-container {
-  padding: 20px;
+  padding: 16px 20px 20px;
+  background-color: var(--el-bg-color);
+  border-radius: 10px;
+  box-shadow: 0 0 10px rgba(32, 76, 131, 0.12);
+}
+
+// 页面标题（对齐 school-iot-admin 的 .head-title：左侧 6px 蓝色竖条）
+.head-title {
+  position: relative;
+  display: flex;
+  align-items: center;
+  margin: 4px 0 16px;
+  padding-left: 14px;
+  font-size: 20px;
+  font-weight: 500;
+  color: var(--el-text-color-primary);
+  &::before {
+    content: "";
+    position: absolute;
+    top: 50%;
+    left: 0;
+    transform: translateY(-50%);
+    width: 6px;
+    height: 17px;
+    border-radius: 10px;
+    background-color: #347df9;
+  }
+  .tle {
+    margin: 0 5px;
+  }
+}
+
+// 主按钮（对齐 school-iot-admin 的 .btn-blue）
+.btn-blue {
+  min-width: 68px;
+  border-radius: 2px;
+  font-weight: 500;
+  color: #ffffff;
+  background-color: #347df9;
+  border-color: #347df9;
+}
+
+// 次按钮（对齐 school-iot-admin 的 .btn-white）
+.btn-white {
+  min-width: 68px;
+  border-radius: 2px;
+  font-weight: 500;
+  color: #347df9;
+  background-color: #ffffff;
+  border: 1px solid #347df9;
 }
 
 html {