chore(styles): 调整格式化配置文件

- 修改prettier.config.mjs: 标签换行
- 修改eslint.config.mjs: 允许自闭合标签（如<br />）

eslint.config.mjs

@@ -3,4 +3,13 @@ import withNuxt from './.nuxt/eslint.config.mjs'
 
 export default withNuxt(
   // Your custom configs here
+  {
+    rules: {
+      "vue/html-self-closing": ["warn", {
+        "html": {
+          "void": "any",
+        }
+      }]
+    }
+  }
 )