feat(frontend): 实现认证模块

页面：
- views/auth/Login.vue，登录页（用户名密码表单、LDAP 认证入口）

API：
- api/auth.ts，认证相关接口（登录、登出、获取用户信息）

功能：
- 登录表单验证
- Mock 数据支持（MVP 阶段无需后端）
- 登录成功后跳转首页

frontend/src/api/auth.ts

@@ -0,0 +1,71 @@
+import request from './request'
+
+export interface LoginRequest {
+  username: string
+  password: string
+}
+
+export interface UserInfo {
+  id: number
+  username: string
+  display_name: string
+  email: string
+  business_line: string
+}
+
+export interface LoginResponse {
+  token: string
+  expires_in: number
+  user: UserInfo
+}
+
+// Mock 数据
+const mockUser: UserInfo = {
+  id: 1,
+  username: 'admin',
+  display_name: '王晓东',
+  email: 'admin@qiniu.com',
+  business_line: 'kodo',
+}
+
+export const authApi = {
+  // 登录
+  login(data: LoginRequest): Promise<any> {
+    // MVP 阶段使用 Mock 数据
+    return new Promise((resolve) => {
+      setTimeout(() => {
+        resolve({
+          code: 0,
+          message: 'success',
+          data: {
+            token: 'mock-jwt-token-' + Date.now(),
+            expires_in: 3600,
+            user: mockUser,
+          },
+        })
+      }, 500)
+    })
+  },
+
+  // 登出
+  logout(): Promise<any> {
+    return new Promise((resolve) => {
+      setTimeout(() => {
+        resolve({ code: 0, message: 'success' })
+      }, 200)
+    })
+  },
+
+  // 获取用户信息
+  getUserInfo(): Promise<any> {
+    return new Promise((resolve) => {
+      setTimeout(() => {
+        resolve({
+          code: 0,
+          message: 'success',
+          data: mockUser,
+        })
+      }, 200)
+    })
+  },
+}

frontend/src/views/auth/Login.vue

@@ -0,0 +1,198 @@
+<template>
+  <div class="login-container">
+    <div class="login-card">
+      <div class="login-header">
+        <div class="brand">
+          <div class="mark">xi</div>
+          xinfra
+        </div>
+        <h2>统一基础设施平台</h2>
+        <p>LDAP 账号登录</p>
+      </div>
+      <el-form
+        ref="formRef"
+        :model="form"
+        :rules="rules"
+        label-position="top"
+        @submit.prevent="handleLogin"
+      >
+        <el-form-item label="用户名" prop="username">
+          <el-input
+            v-model="form.username"
+            placeholder="请输入用户名"
+            prefix-icon="User"
+            size="large"
+          />
+        </el-form-item>
+        <el-form-item label="密码" prop="password">
+          <el-input
+            v-model="form.password"
+            type="password"
+            placeholder="请输入密码"
+            prefix-icon="Lock"
+            size="large"
+            show-password
+          />
+        </el-form-item>
+        <el-form-item>
+          <el-button
+            type="primary"
+            size="large"
+            :loading="loading"
+            @click="handleLogin"
+            style="width: 100%"
+          >
+            登录
+          </el-button>
+        </el-form-item>
+      </el-form>
+      <div class="login-footer">
+        <p>统一 LDAP 账号，同账号同密码</p>
+      </div>
+    </div>
+  </div>
+</template>
+
+<script setup lang="ts">
+import { ref, reactive } from 'vue'
+import { useRouter } from 'vue-router'
+import { useAuth } from '@/composables/useAuth'
+import { ElMessage } from 'element-plus'
+import type { FormInstance, FormRules } from 'element-plus'
+
+const router = useRouter()
+const { login } = useAuth()
+const formRef = ref<FormInstance>()
+const loading = ref(false)
+
+const form = reactive({
+  username: '',
+  password: '',
+})
+
+const rules: FormRules = {
+  username: [{ required: true, message: '请输入用户名', trigger: 'blur' }],
+  password: [{ required: true, message: '请输入密码', trigger: 'blur' }],
+}
+
+const handleLogin = async () => {
+  const valid = await formRef.value?.validate().catch(() => false)
+  if (!valid) return
+
+  loading.value = true
+  try {
+    await login(form.username, form.password)
+    ElMessage.success('登录成功')
+    router.push('/')
+  } catch (error: any) {
+    ElMessage.error(error.message || '登录失败')
+  } finally {
+    loading.value = false
+  }
+}
+</script>
+
+<style scoped>
+.login-container {
+  min-height: 100vh;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  background: var(--bg-deep);
+}
+
+.login-card {
+  width: 400px;
+  background: var(--bg-panel);
+  border: 1px solid var(--line);
+  border-radius: 12px;
+  padding: 40px;
+}
+
+.login-header {
+  text-align: center;
+  margin-bottom: 32px;
+}
+
+.login-header .brand {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  gap: 10px;
+  font-size: 24px;
+  font-weight: 700;
+  margin-bottom: 12px;
+}
+
+.login-header .brand .mark {
+  width: 36px;
+  height: 36px;
+  border-radius: 8px;
+  background: linear-gradient(135deg, var(--accent), #1C8F69);
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  font-family: var(--mono);
+  font-size: 16px;
+  font-weight: 600;
+  color: #08140F;
+}
+
+.login-header h2 {
+  margin: 0 0 8px;
+  font-size: 18px;
+  font-weight: 600;
+}
+
+.login-header p {
+  margin: 0;
+  color: var(--text-dim);
+  font-size: 14px;
+}
+
+.login-footer {
+  text-align: center;
+  margin-top: 24px;
+  padding-top: 16px;
+  border-top: 1px solid var(--line-soft);
+}
+
+.login-footer p {
+  margin: 0;
+  color: var(--text-dim);
+  font-size: 12px;
+}
+
+:deep(.el-form-item__label) {
+  color: var(--text-mid);
+}
+
+:deep(.el-input__wrapper) {
+  background: var(--bg-panel-2);
+  border: 1px solid var(--line);
+  box-shadow: none;
+}
+
+:deep(.el-input__wrapper:hover) {
+  border-color: #3A4356;
+}
+
+:deep(.el-input__wrapper.is-focus) {
+  border-color: var(--accent);
+}
+
+:deep(.el-input__inner) {
+  color: var(--text-hi);
+}
+
+:deep(.el-button--primary) {
+  background: var(--accent);
+  border-color: var(--accent);
+  color: #06150F;
+  font-weight: 600;
+}
+
+:deep(.el-button--primary:hover) {
+  background: #55E8B3;
+}
+</style>