fix(media): 资源交付 - 按内容识别上传类型并统一重试与附件交付 (#678)

Co-authored-by: ddcat666 <26564566+ddcat666@users.noreply.github.com>

backend/go.mod

@@ -4,6 +4,7 @@ go 1.25.0
 
 require (
 	github.com/aws/aws-sdk-go v1.45.5
+	github.com/gabriel-vasile/mimetype v1.4.13
 	github.com/gin-gonic/gin v1.12.0
 	github.com/google/uuid v1.5.0
 	github.com/qiniu/go-sdk/v7 v7.27.0
@@ -32,7 +33,6 @@ require (
 	github.com/cespare/xxhash/v2 v2.3.0 // indirect
 	github.com/clbanning/mxj v1.8.4 // indirect
 	github.com/cloudwego/base64x v0.1.7 // indirect
-	github.com/gabriel-vasile/mimetype v1.4.13 // indirect
 	github.com/gin-contrib/sse v1.1.1 // indirect
 	github.com/go-playground/locales v0.14.1 // indirect
 	github.com/go-playground/universal-translator v0.18.1 // indirect