feat(admin): 添加评论数据看板功能

- 新增数据看板页面，展示评论统计信息
- 添加 echarts 依赖用于数据可视化
- 实现后端统计接口，包括总数、按域名和最近7天数据
- 完善前端统计页面样式和交互
- 更新文档说明和版本更新指南

cwd-admin/src/api/admin.ts

@@ -62,6 +62,26 @@ export type EmailNotifySettingsResponse = {
 	};
 };
 
+export type CommentStatsResponse = {
+	summary: {
+		total: number;
+		approved: number;
+		pending: number;
+		rejected: number;
+	};
+	domains: {
+		domain: string;
+		total: number;
+		approved: number;
+		pending: number;
+		rejected: number;
+	}[];
+	last7Days: {
+		date: string;
+		total: number;
+	}[];
+};
+
 export async function loginAdmin(name: string, password: string): Promise<string> {
 	const res = await post<AdminLoginResponse>('/admin/login', { name, password });
 	const key = res.data.key;
@@ -160,3 +180,7 @@ export function exportComments(): Promise<any[]> {
 export function importComments(data: any[]): Promise<{ message: string }> {
 	return post<{ message: string }>('/admin/comments/import', data);
 }
+
+export function fetchCommentStats(): Promise<CommentStatsResponse> {
+	return get<CommentStatsResponse>('/admin/stats/comments');
+}