feat(goctl): support custom Swagger response status (#5691)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

tools/goctl/api/swagger/example/example_cn.api

@@ -84,6 +84,7 @@ type (
 service Swagger {
 	@doc (
 		description: "form 接口"
+		respCode: "201" // 对应 Swagger 的 HTTP 状态码
 	)
 	@handler form
 	post /form (FormReq) returns (FormResp)
@@ -244,4 +245,3 @@ service Swagger {
 	@handler jsonComplex
 	post /json/complex (ComplexJsonReq) returns (ComplexJsonResp)
 }
-