chore: 从 git 中移除 backend/target 目录

- 使用 git rm --cached 从版本控制中删除 target 目录
- .gitignore 已配置忽略 target 和 node_modules
- 本地文件保留，仅从 git 索引中删除

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

frontend/src/views/Layout.vue

@@ -25,6 +25,10 @@
           <el-icon><Shop /></el-icon>
           <span>经销商管理</span>
         </el-menu-item>
+        <el-menu-item v-if="userStore.isAdmin" index="/system-config">
+          <el-icon><Setting /></el-icon>
+          <span>系统配置</span>
+        </el-menu-item>
       </el-menu>
     </el-aside>
     <el-container>
@@ -47,6 +51,10 @@
               </span>
               <template #dropdown>
                 <el-dropdown-menu>
+                  <el-dropdown-item @click="showChangePasswordDialog = true">
+                    <el-icon><Lock /></el-icon>
+                    修改密码
+                  </el-dropdown-item>
                   <el-dropdown-item @click="handleLogout">
                     <el-icon><SwitchButton /></el-icon>
                     退出登录
@@ -61,14 +69,55 @@
         <router-view />
       </el-main>
     </el-container>
+
+    <!-- 修改密码对话框 -->
+    <el-dialog
+      v-model="showChangePasswordDialog"
+      title="修改密码"
+      width="500px"
+      @close="handleDialogClose"
+    >
+      <el-form ref="formRef" :model="passwordForm" :rules="passwordRules" label-width="100px">
+        <el-form-item label="原密码" prop="oldPassword">
+          <el-input
+            v-model="passwordForm.oldPassword"
+            type="password"
+            placeholder="请输入原密码"
+            show-password
+          />
+        </el-form-item>
+        <el-form-item label="新密码" prop="newPassword">
+          <el-input
+            v-model="passwordForm.newPassword"
+            type="password"
+            placeholder="请输入新密码（6-20位）"
+            show-password
+          />
+        </el-form-item>
+        <el-form-item label="确认密码" prop="confirmPassword">
+          <el-input
+            v-model="passwordForm.confirmPassword"
+            type="password"
+            placeholder="请再次输入新密码"
+            show-password
+          />
+        </el-form-item>
+      </el-form>
+      <template #footer>
+        <el-button @click="showChangePasswordDialog = false">取消</el-button>
+        <el-button type="primary" @click="handleChangePassword">确定</el-button>
+      </template>
+    </el-dialog>
   </el-container>
 </template>
 
 <script setup lang="ts">
-import { computed } from 'vue'
+import { computed, reactive, ref } from 'vue'
 import { useRoute, useRouter } from 'vue-router'
-import { ElMessageBox } from 'element-plus'
+import { ElMessage, ElMessageBox, type FormInstance, type FormRules } from 'element-plus'
 import { useUserStore } from '@/stores/user'
+import { changePassword } from '@/api/auth'
+import { hashPassword } from '@/utils/crypto'
 
 const route = useRoute()
 const router = useRouter()
@@ -77,11 +126,81 @@ const userStore = useUserStore()
 const activeMenu = computed(() => route.path)
 const currentPageTitle = computed(() => route.meta.title as string || '首页')
 
+// 修改密码对话框
+const showChangePasswordDialog = ref(false)
+const formRef = ref<FormInstance>()
+const passwordForm = reactive({
+  oldPassword: '',
+  newPassword: '',
+  confirmPassword: ''
+})
+
+const passwordRules: FormRules = {
+  oldPassword: [{ required: true, message: '请输入原密码', trigger: 'blur' }],
+  newPassword: [
+    { required: true, message: '请输入新密码', trigger: 'blur' },
+    { min: 6, max: 20, message: '新密码长度必须在6-20位之间', trigger: 'blur' }
+  ],
+  confirmPassword: [
+    { required: true, message: '请再次输入新密码', trigger: 'blur' },
+    {
+      validator: (rule, value, callback) => {
+        if (value !== passwordForm.newPassword) {
+          callback(new Error('两次输入的密码不一致'))
+        } else {
+          callback()
+        }
+      },
+      trigger: 'blur'
+    }
+  ]
+}
+
+const handleChangePassword = async () => {
+  if (!formRef.value) return
+  await formRef.value.validate(async (valid) => {
+    if (valid) {
+      try {
+        // 对密码进行 SHA-256 哈希后再传输
+        const hashedOldPassword = await hashPassword(passwordForm.oldPassword)
+        const hashedNewPassword = await hashPassword(passwordForm.newPassword)
+
+        await changePassword({
+          oldPassword: hashedOldPassword,
+          newPassword: hashedNewPassword
+        })
+        ElMessage.success('密码修改成功，请重新登录')
+        showChangePasswordDialog.value = false
+        // 退出登录
+        userStore.logout()
+        router.push('/login')
+      } catch (error) {
+        console.error('修改密码失败', error)
+      }
+    }
+  })
+}
+
+const handleDialogClose = () => {
+  formRef.value?.resetFields()
+  Object.assign(passwordForm, {
+    oldPassword: '',
+    newPassword: '',
+    confirmPassword: ''
+  })
+}
+
 const handleLogout = async () => {
   try {
-    await ElMessageBox.confirm('确定要退出登录吗？', '提示', {
-      type: 'warning'
-    })
+    await ElMessageBox.confirm(
+      '确定要退出登录吗？',
+      '提示',
+      {
+        confirmButtonText: '确定',
+        cancelButtonText: '取消',
+        type: 'warning'
+      }
+    )
     userStore.logout()
     router.push('/login')
   } catch {