feat(plugin): timeseries 聚合 API — date_trunc 时间序列

crates/erp-plugin/src/data_dto.rs

@@ -83,3 +83,25 @@ pub struct BatchActionReq {
     /// batch_update 时的更新数据
     pub data: Option<serde_json::Value>,
 }
+
+/// 时间序列查询参数
+#[derive(Debug, Serialize, Deserialize, utoipa::IntoParams)]
+pub struct TimeseriesParams {
+    /// 时间字段名
+    pub time_field: String,
+    /// 时间粒度: "day" / "week" / "month"
+    pub time_grain: String,
+    /// 开始日期 (ISO)
+    pub start: Option<String>,
+    /// 结束日期 (ISO)
+    pub end: Option<String>,
+}
+
+/// 时间序列数据项
+#[derive(Debug, Serialize, Deserialize, utoipa::ToSchema)]
+pub struct TimeseriesItem {
+    /// 时间周期
+    pub period: String,
+    /// 计数
+    pub count: i64,
+}