refactor: 移除ant-design-vue和tailwindcss依赖并优化样式

style: 统一使用css替换scss并调整组件样式
style: 优化组件布局和属性顺序
chore: 更新.gitignore和.eslintrc配置

novalon-manage-web/src/views/system/Login.vue

@@ -6,25 +6,38 @@
       </template>
       <el-form
         :model="formState"
-        @submit.prevent="onFinish"
         label-position="top"
+        @submit.prevent="onFinish"
       >
         <el-form-item
           label="用户名"
           prop="username"
           :rules="[{ required: true, message: '请输入用户名', trigger: 'blur' }]"
         >
-          <el-input v-model="formState.username" placeholder="请输入用户名" />
+          <el-input
+            v-model="formState.username"
+            placeholder="请输入用户名"
+          />
         </el-form-item>
         <el-form-item
           label="密码"
           prop="password"
           :rules="[{ required: true, message: '请输入密码', trigger: 'blur' }]"
         >
-          <el-input v-model="formState.password" type="password" placeholder="请输入密码" show-password />
+          <el-input
+            v-model="formState.password"
+            type="password"
+            placeholder="请输入密码"
+            show-password
+          />
         </el-form-item>
         <el-form-item>
-          <el-button type="primary" native-type="submit" :loading="loading" style="width: 100%">
+          <el-button
+            type="primary"
+            native-type="submit"
+            :loading="loading"
+            style="width: 100%"
+          >
             登录
           </el-button>
         </el-form-item>
@@ -63,13 +76,13 @@ const onFinish = async () => {
 }
 </script>
 
-<style scoped lang="scss">
+<style scoped lang="css">
 .login-container {
   display: flex;
   justify-content: center;
   align-items: center;
   min-height: 100vh;
-  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
+  background: var(--el-color-primary-light-9);
 
   .login-card {
     width: 400px;