后台看板增加时段显示和新增用户数量

后台 Dashboard 日期控件改为起始日期和终止日期

新增本时段筛选并扩展前后端 Dashboard 查询契约

新增新增用户数指标，按 profile_dashboard_state.created_at 统计当前时间窗注册账号

补充后台看板测试和运营看板文档口径

apps/admin-web/src/styles/admin.css

@@ -284,10 +284,17 @@ button:disabled {
 }
 
 .admin-dashboard-granularity {
-  width: 188px;
+  width: 250px;
   flex: 0 0 auto;
 }
 
+.admin-dashboard-period-fields {
+  display: grid;
+  width: 352px;
+  grid-template-columns: repeat(2, minmax(0, 1fr));
+  gap: 10px;
+}
+
 .admin-dashboard-date-field {
   width: 170px;
 }
@@ -1279,11 +1286,16 @@ button:disabled {
   }
 
   .admin-dashboard-granularity,
+  .admin-dashboard-period-fields,
   .admin-dashboard-date-field,
   .admin-dashboard-actions .admin-secondary-button {
     width: 100%;
   }
 
+  .admin-dashboard-period-fields {
+    grid-template-columns: repeat(2, minmax(0, 1fr));
+  }
+
   .admin-dashboard-metric-grid,
   .admin-dashboard-operation-grid {
     grid-template-columns: repeat(2, minmax(0, 1fr));
@@ -1351,6 +1363,10 @@ button:disabled {
     width: 100%;
   }
 
+  .admin-dashboard-period-fields {
+    grid-template-columns: 1fr;
+  }
+
   .admin-dashboard-metric-grid,
   .admin-dashboard-operation-grid {
     grid-template-columns: 1fr;