feat: bff resp string to json

bff/go.mod

@@ -3,7 +3,6 @@ module bff
 go 1.26
 
 require (
-	github.com/go-playground/validator/v10 v10.30.3
 	github.com/zeromicro/go-zero v1.10.2
 	google.golang.org/grpc v1.80.0
 	pkg.local v0.0.0
@@ -25,15 +24,12 @@ require (
 	github.com/fatih/color v1.18.0 // indirect
 	github.com/fullstorydev/grpcurl v1.9.3 // indirect
 	github.com/fxamacker/cbor/v2 v2.9.0 // indirect
-	github.com/gabriel-vasile/mimetype v1.4.13 // indirect
 	github.com/go-jose/go-jose/v4 v4.1.3 // indirect
 	github.com/go-logr/logr v1.4.3 // indirect
 	github.com/go-logr/stdr v1.2.2 // indirect
 	github.com/go-openapi/jsonpointer v0.21.0 // indirect
 	github.com/go-openapi/jsonreference v0.20.2 // indirect
 	github.com/go-openapi/swag v0.23.0 // indirect
-	github.com/go-playground/locales v0.14.1 // indirect
-	github.com/go-playground/universal-translator v0.18.1 // indirect
 	github.com/gogo/protobuf v1.3.2 // indirect
 	github.com/golang-jwt/jwt/v4 v4.5.2 // indirect
 	github.com/golang/protobuf v1.5.4 // indirect
@@ -48,7 +44,6 @@ require (
 	github.com/josharian/intern v1.0.0 // indirect
 	github.com/json-iterator/go v1.1.12 // indirect
 	github.com/klauspost/compress v1.18.6 // indirect
-	github.com/leodido/go-urn v1.4.0 // indirect
 	github.com/mailru/easyjson v0.7.7 // indirect
 	github.com/mattn/go-colorable v0.1.13 // indirect
 	github.com/mattn/go-isatty v0.0.20 // indirect
@@ -91,13 +86,12 @@ require (
 	go.uber.org/zap v1.24.0 // indirect
 	go.yaml.in/yaml/v2 v2.4.2 // indirect
 	go.yaml.in/yaml/v3 v3.0.4 // indirect
-	golang.org/x/crypto v0.52.0 // indirect
-	golang.org/x/net v0.54.0 // indirect
+	golang.org/x/net v0.56.0 // indirect
 	golang.org/x/oauth2 v0.34.0 // indirect
-	golang.org/x/sync v0.20.0 // indirect
-	golang.org/x/sys v0.45.0 // indirect
-	golang.org/x/term v0.43.0 // indirect
-	golang.org/x/text v0.37.0 // indirect
+	golang.org/x/sync v0.21.0 // indirect
+	golang.org/x/sys v0.46.0 // indirect
+	golang.org/x/term v0.44.0 // indirect
+	golang.org/x/text v0.38.0 // indirect
 	golang.org/x/time v0.14.0 // indirect
 	google.golang.org/genproto/googleapis/api v0.0.0-20260128011058-8636f8732409 // indirect
 	google.golang.org/genproto/googleapis/rpc v0.0.0-20260128011058-8636f8732409 // indirect