更新CHANGELOG，修复模板样式保持问题，重构样式复制机制，优化代码结构，更新README示例中的方法调用，确保API向下兼容，增加测试用例以验证修复效果。

examples/table_layout/main.go

@@ -19,10 +19,10 @@ func main() {
 	title := doc.AddParagraph("表格布局和尺寸功能演示")
 	title.SetAlignment(document.AlignCenter)
 	titleFormat := &document.TextFormat{
-		Bold:      true,
-		FontSize:  18,
-		FontColor: "2F5496",
-		FontName:  "微软雅黑",
+		Bold:       true,
+		FontSize:   18,
+		FontColor:  "2F5496",
+		FontFamily: "微软雅黑",
 	}
 	title.AddFormattedText("", titleFormat)
 
@@ -45,10 +45,10 @@ func main() {
 	// 设置表头格式
 	headerFormat := &document.CellFormat{
 		TextFormat: &document.TextFormat{
-			Bold:      true,
-			FontSize:  12,
-			FontColor: "FFFFFF",
-			FontName:  "微软雅黑",
+			Bold:       true,
+			FontSize:   12,
+			FontColor:  "FFFFFF",
+			FontFamily: "微软雅黑",
 		},
 		HorizontalAlign: document.CellAlignCenter,
 		VerticalAlign:   document.CellVAlignCenter,
@@ -203,10 +203,10 @@ func main() {
 	for col := 0; col < 4; col++ {
 		complexTable.SetCellFormat(0, col, &document.CellFormat{
 			TextFormat: &document.TextFormat{
-				Bold:      true,
-				FontSize:  14,
-				FontColor: "FFFFFF",
-				FontName:  "微软雅黑",
+				Bold:       true,
+				FontSize:   14,
+				FontColor:  "FFFFFF",
+				FontFamily: "微软雅黑",
 			},
 			HorizontalAlign: document.CellAlignCenter,
 			VerticalAlign:   document.CellVAlignCenter,