feat(转换能力): 新增PDF解析、可编辑OFD转换及WebUI打开能力

go.mod

@@ -6,9 +6,10 @@ require (
 	github.com/emmansun/gmsm v0.44.1
 	github.com/go-fonts/latin-modern v0.3.3
 	github.com/go-text/typesetting v0.3.5
-	github.com/tdewolff/canvas v0.0.0-20260913163248-dd4999d1c76a
+	github.com/tdewolff/canvas v0.0.0-20260923214215-09804640d00c
 	github.com/tdewolff/font v0.0.0-20260913163313-54f98bb59ee6
 	github.com/xiaoqidun/jbig2 v1.1.1
+	github.com/xiaoqidun/pdfgo v0.0.0-20260924080829-a19c3fd78f51
 	golang.org/x/crypto v0.57.0
 	golang.org/x/image v0.46.0
 	golang.org/x/text v0.42.0