fix: move app not in util folder

app/di.go

+package app
+
+import "github.com/google/wire"
+
+var AppSet = wire.NewSet(
+	// app
+	New,
+	wire.Bind(new(Server), new(*HttpServer)),
+)

di.go

@@ -6,6 +6,7 @@ package main
 import (
 	"github.com/google/wire"
 
+	"gitlab.informatika.org/ocw/ocw-backend/app"
 	"gitlab.informatika.org/ocw/ocw-backend/handler"
 	"gitlab.informatika.org/ocw/ocw-backend/middleware"
 	"gitlab.informatika.org/ocw/ocw-backend/provider"
@@ -13,8 +14,6 @@ import (
 	"gitlab.informatika.org/ocw/ocw-backend/routes"
 	"gitlab.informatika.org/ocw/ocw-backend/service"
 	"gitlab.informatika.org/ocw/ocw-backend/utils"
-
-	"gitlab.informatika.org/ocw/ocw-backend/utils/app"
 )
 
 func CreateServer() (app.Server, error) {
@@ -26,6 +25,7 @@ func CreateServer() (app.Server, error) {
 		routes.RoutesSet,
 		service.ServiceSet,
 		provider.ProviderSet,
+		app.AppSet,
 	)
 
 	return nil, nil

test/api.go

 package test
 
 import (
+	"gitlab.informatika.org/ocw/ocw-backend/app"
 	"gitlab.informatika.org/ocw/ocw-backend/test/db"
-	"gitlab.informatika.org/ocw/ocw-backend/utils/app"
 )
 
 type ApiTestPack struct {

test/di.go

@@ -6,6 +6,7 @@ package test
 import (
 	"github.com/google/wire"
 
+	"gitlab.informatika.org/ocw/ocw-backend/app"
 	"gitlab.informatika.org/ocw/ocw-backend/handler"
 	"gitlab.informatika.org/ocw/ocw-backend/middleware"
 	"gitlab.informatika.org/ocw/ocw-backend/provider"
@@ -31,6 +32,7 @@ func CreateServer(logger logger.Logger, envTest *env.Environment) (*ApiTestPack,
 		service.ServiceTestSet,
 		db.DbTestSet,
 		provider.ProviderTestSet,
+		app.AppSet,
 	)
 
 	return nil, nil

utils/di.go

@@ -2,7 +2,6 @@ package utils
 
 import (
 	"github.com/google/wire"
-	"gitlab.informatika.org/ocw/ocw-backend/utils/app"
 	"gitlab.informatika.org/ocw/ocw-backend/utils/base64"
 	"gitlab.informatika.org/ocw/ocw-backend/utils/env"
 	"gitlab.informatika.org/ocw/ocw-backend/utils/httputil"
@@ -41,10 +40,6 @@ var UtilSetTest = wire.NewSet(
 	// Token utility
 	wire.Struct(new(token.TokenUtilImpl), "*"),
 	wire.Bind(new(token.TokenUtil), new(*token.TokenUtilImpl)),
-
-	// app
-	app.New,
-	wire.Bind(new(app.Server), new(*app.HttpServer)),
 )
 
 var UtilSet = wire.NewSet(