报告XP.ReportEngine：新增 IReportService接口封装完整报告生成流程，支持外部类库直接调用；新增 ReportRequest、ReportServiceResult 请求/响应模型；新增引擎预热机制；PDF 生成改为 Task.Run 后台线程执行，解决进度窗口和主窗口卡死问题；完善文档。

XP.ReportEngine/Services/ITextPdfRenderer.cs

@@ -85,6 +85,12 @@ namespace XP.ReportEngine.Services
             _logger.Info("开始 PDF 渲染，共 {PageCount} 页 | Starting PDF rendering, {PageCount} pages", pages?.Count ?? 0);
             _currentTemplate = template;
 
+            // 每次渲染重置字体，避免跨 PdfDocument 复用导致 "belongs to other PDF document" 错误
+            // Reset fonts on each render to avoid cross-PdfDocument reuse error
+            _fontsInitialized = false;
+            _cjkFont = null;
+            _westernFont = null;
+
             var memoryStream = new MemoryStream();
 
             try
@@ -130,6 +136,8 @@ namespace XP.ReportEngine.Services
                 {
                     for (int i = 0; i < pages.Count; i++)
                     {
+                        var pageStopwatch = System.Diagnostics.Stopwatch.StartNew();
+
                         if (i > 0)
                         {
                             // 添加新页面 | Add new page
@@ -148,6 +156,10 @@ namespace XP.ReportEngine.Services
                         }
 
                         RenderPage(document, pages[i]);
+
+                        pageStopwatch.Stop();
+                        _logger.Info("第 {PageIndex}/{TotalPages} 页渲染完成，类型: {PageType}，元素数: {ElementCount}，耗时: {ElapsedMs}ms | Page {PageIndex}/{TotalPages} rendered, type: {PageType}, elements: {ElementCount}, elapsed: {ElapsedMs}ms",
+                            i + 1, pages.Count, pages[i].PageType ?? "unknown", pages[i].Elements?.Count ?? 0, pageStopwatch.ElapsedMilliseconds);
                     }
                 }
 
@@ -157,9 +169,13 @@ namespace XP.ReportEngine.Services
                     headerFooterHandler.WriteTotal(pdfDocument);
                 }
 
-                // 仅关闭 Document（它会级联关闭 PdfDocument 和 PdfWriter）
-                // Only close Document (it cascades to PdfDocument and PdfWriter)
+                // 关闭文档（触发字体子集化嵌入 + PDF 交叉引用表写入 + 流压缩）
+                // Close document (triggers font subsetting + PDF cross-reference table writing + stream compression)
+                _logger.Info("开始关闭文档（字体嵌入 + 压缩）| Starting document close (font embedding + compression)");
+                var closeStopwatch = System.Diagnostics.Stopwatch.StartNew();
                 document.Close();
+                closeStopwatch.Stop();
+                _logger.Info("文档关闭完成，耗时: {ElapsedMs}ms | Document close completed, elapsed: {ElapsedMs}ms", closeStopwatch.ElapsedMilliseconds);
 
                 // 重置流位置以便后续读取 | Reset stream position for subsequent reading
                 memoryStream.Position = 0;