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

cwd-api/src/api/admin/featureSettings.ts

@@ -25,10 +25,15 @@ export const updateFeatureSettings = async (c: Context<{ Bindings: Bindings }>)
 			typeof body.enableArticleLike === 'boolean'
 				? body.enableArticleLike
 				: undefined;
+		const rawCommentPlaceholder =
+			typeof body.commentPlaceholder === 'string' ? body.commentPlaceholder : undefined;
+		const commentPlaceholder =
+			rawCommentPlaceholder !== undefined ? rawCommentPlaceholder.trim() : undefined;
 
 		await saveFeatureSettings(c.env, {
 			enableCommentLike,
-			enableArticleLike
+			enableArticleLike,
+			commentPlaceholder
 		});
 
 		return c.json({ message: '保存成功！' });

cwd-api/src/utils/featureSettings.ts

@@ -2,10 +2,12 @@ import { Bindings } from '../bindings';
 
 export const FEATURE_COMMENT_LIKE_KEY = 'comment_feature_comment_like';
 export const FEATURE_ARTICLE_LIKE_KEY = 'comment_feature_article_like';
+export const FEATURE_COMMENT_PLACEHOLDER_KEY = 'comment_feature_placeholder';
 
 export type FeatureSettings = {
 	enableCommentLike: boolean;
 	enableArticleLike: boolean;
+	commentPlaceholder?: string;
 };
 
 export async function loadFeatureSettings(env: Bindings): Promise<FeatureSettings> {
@@ -13,9 +15,9 @@ export async function loadFeatureSettings(env: Bindings): Promise<FeatureSetting
 		'CREATE TABLE IF NOT EXISTS Settings (key TEXT PRIMARY KEY, value TEXT NOT NULL)'
 	).run();
 
-	const keys = [FEATURE_COMMENT_LIKE_KEY, FEATURE_ARTICLE_LIKE_KEY];
+	const keys = [FEATURE_COMMENT_LIKE_KEY, FEATURE_ARTICLE_LIKE_KEY, FEATURE_COMMENT_PLACEHOLDER_KEY];
 	const { results } = await env.CWD_DB.prepare(
-		'SELECT key, value FROM Settings WHERE key IN (?, ?)'
+		'SELECT key, value FROM Settings WHERE key IN (?, ?, ?)'
 	)
 		.bind(...keys)
 		.all<{ key: string; value: string }>();
@@ -47,9 +49,12 @@ export async function loadFeatureSettings(env: Bindings): Promise<FeatureSetting
 	const enableArticleLikeRaw = map.get(FEATURE_ARTICLE_LIKE_KEY);
 	const enableArticleLike = enableArticleLikeRaw !== '0'; // Default to true if missing or '1'
 
+	const commentPlaceholder = map.get(FEATURE_COMMENT_PLACEHOLDER_KEY);
+
 	return {
 		enableCommentLike,
-		enableArticleLike
+		enableArticleLike,
+		commentPlaceholder
 	};
 }
 
@@ -79,6 +84,10 @@ export async function saveFeatureSettings(
 						? '1'
 						: '0'
 					: undefined
+		},
+		{
+			key: FEATURE_COMMENT_PLACEHOLDER_KEY,
+			value: settings.commentPlaceholder
 		}
 	];