feat: 新增评论框提示文案自定义功能并优化侧边栏排序

- 新增评论框提示文案（placeholder）自定义功能，支持在后台设置
- 更新文档：重命名“点赞开关”为“功能开关”，调整侧边栏排序
- 优化前端组件，统一处理评论表单和回复编辑器的提示文案
- 修复CSS样式，确保操作按钮始终可见

docs/.vitepress/configs/sidebar.js

@@ -12,12 +12,12 @@ export const rootSidebar = [
 		text: '功能',
 		items: [
 			{ text: '后台设置', link: '/function/admin-panel' },
-			{ text: '通知邮箱', link: '/function/email-reminder' },
+			{ text: '邮箱提醒', link: '/function/email-reminder' },
 			{ text: 'Telegram 通知', link: '/function/telegram-notify' },
 			{ text: '安全设置', link: '/function/security-settings' },
+			{ text: '功能开关', link: '/function/feature-settings' },
+			{ text: '数据看板', link: '/function/data-statistics' },
 			{ text: '数据管理', link: '/function/data-migration' },
-			{ text: '点赞开关', link: '/function/feature-settings' },
-			{ text: '数据统计', link: '/function/data-statistics' },
 		],
 	},
 	{ text: '反馈', link: '/guide/feedback' },