init: hgmj server initial commit

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

web/service/adser/error.go

@@ -0,0 +1,29 @@
+package adser
+
+type ErrImgURLInvalid struct {
+}
+
+func (ErrImgURLInvalid) Error() string {
+	return "picture url is invalid!"
+}
+
+type ErrImgTooBig struct {
+}
+
+func (ErrImgTooBig) Error() string {
+	return "picture is too big!"
+}
+
+type ErrImgScale struct {
+}
+
+func (ErrImgScale) Error() string {
+	return "picture cale is invalid!"
+}
+
+type ErrImgContent struct {
+}
+
+func (ErrImgContent) Error() string {
+	return "picture is invalid!"
+}