feat(auth): 添加用户认证模块与登录页面

src/pages/Login.page.vue

@@ -1,5 +1,87 @@
-<script setup lang="ts"></script>
+<script setup lang="ts">
+definePage({ meta: { ignoreAuth: true, layout: false } });
+
+const router = useRouter();
+const userStore = useAuthStore();
+const message = useMessage();
+
+const formValue = ref({
+  username: 'admin',
+  password: 'admin',
+});
+
+const loading = ref(false);
+
+async function handleLogin() {
+  if (!formValue.value.username || !formValue.value.password) {
+    message.warning('请输入用户名和密码');
+    return;
+  }
+
+  loading.value = true;
+  try {
+    const result = await userStore.login(formValue.value.username, formValue.value.password);
+    if (result.success) {
+      message.success('登录成功');
+      router.push('/');
+    } else {
+      message.error(result.message || '登录失败');
+    }
+  } catch {
+    message.error('登录异常');
+  } finally {
+    loading.value = false;
+  }
+}
+</script>
 
 <template>
-  <div>Login</div>
+  <div class="login-page">
+    <NCard class="login-card" title="用户登录">
+      <NForm :model="formValue" label-placement="left" label-width="80">
+        <NFormItem label="用户名" path="username">
+          <NInput
+            v-model:value="formValue.username"
+            placeholder="请输入用户名"
+            @keyup.enter="handleLogin"
+          />
+        </NFormItem>
+        <NFormItem label="密码" path="password">
+          <NInput
+            v-model:value="formValue.password"
+            type="password"
+            show-password-on="click"
+            placeholder="请输入密码"
+            @keyup.enter="handleLogin"
+          />
+        </NFormItem>
+        <NFormItem :show-label="false">
+          <NButton type="primary" block :loading="loading" @click="handleLogin"> 登录 </NButton>
+        </NFormItem>
+      </NForm>
+      <div class="login-hint">
+        <NText depth="3">提示：用户名和密码均为 admin</NText>
+      </div>
+    </NCard>
+  </div>
 </template>
+
+<style scoped lang="scss">
+.login-page {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  min-height: 100vh;
+  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
+}
+
+.login-card {
+  width: 400px;
+  max-width: 90%;
+}
+
+.login-hint {
+  margin-top: 16px;
+  text-align: center;
+}
+</style>