feat: add reports endpoint with get report and list reports methods

Implement ReportInfo, ReportData, and ReportRow models. Add get_report
(with optional data format and data type params) and list_reports
(paginated) methods. Tests cover report data retrieval, format
parameters, listing reports by app, and not-found error.

src/endpoints/mod.rs

@@ -4,3 +4,4 @@ mod files;
 mod lists;
 mod ping;
 mod records;
+mod reports;

src/endpoints/reports.rs

@@ -0,0 +1,46 @@
+use reqwest::Method;
+
+use crate::client::OnspringClient;
+use crate::error::Result;
+use crate::models::{
+    DataFormat, PagedResponse, PagingRequest, ReportData, ReportDataType, ReportInfo,
+};
+
+impl OnspringClient {
+    /// Gets report data by report ID.
+    pub async fn get_report(
+        &self,
+        report_id: i32,
+        data_format: Option<DataFormat>,
+        data_type: Option<ReportDataType>,
+    ) -> Result<ReportData> {
+        let path = format!("/Reports/id/{}", report_id);
+        let mut query = Vec::new();
+        if let Some(fmt) = data_format {
+            query.push(("apiDataFormat", format!("{:?}", fmt)));
+        }
+        if let Some(dt) = data_type {
+            query.push(("dataType", format!("{:?}", dt)));
+        }
+        let query_refs: Vec<(&str, String)> = query.iter().map(|(k, v)| (*k, v.clone())).collect();
+        self.request(Method::GET, &path, &query_refs, Option::<&()>::None)
+            .await
+    }
+
+    /// Gets a paginated list of reports for a given application.
+    pub async fn list_reports(
+        &self,
+        app_id: i32,
+        paging: Option<PagingRequest>,
+    ) -> Result<PagedResponse<ReportInfo>> {
+        let path = format!("/Reports/appId/{}", app_id);
+        let mut query = Vec::new();
+        if let Some(p) = paging {
+            query.push(("PageNumber", p.page_number.to_string()));
+            query.push(("PageSize", p.page_size.to_string()));
+        }
+        let query_refs: Vec<(&str, String)> = query.iter().map(|(k, v)| (*k, v.clone())).collect();
+        self.request(Method::GET, &path, &query_refs, Option::<&()>::None)
+            .await
+    }
+}