feat: Refactor user context handling and service methods

- Updated middleware to fetch user and tenant models by ID and set them in context.
- Refactored common service methods to accept userID as a parameter instead of extracting from context.
- Modified content service methods to include userID as a parameter for better clarity and performance.
- Adjusted coupon, creator, notification, order, tenant, user, and wallet services to utilize userID directly.
- Enhanced context key constants for improved readability and maintainability.

backend/app/services/common.go

@@ -22,13 +22,7 @@ type common struct {
 	storage *storage.Storage
 }
 
-func (s *common) Upload(ctx context.Context, file *multipart.FileHeader, typeArg string) (*common_dto.UploadResult, error) {
-	userID := ctx.Value(consts.CtxKeyUser)
-	if userID == nil {
-		return nil, errorx.ErrUnauthorized
-	}
-	uid := cast.ToInt64(userID)
-
+func (s *common) Upload(ctx context.Context, userID int64, file *multipart.FileHeader, typeArg string) (*common_dto.UploadResult, error) {
 	// Mock Upload to S3/MinIO (Here we just generate key, actual upload handling via direct upload or stream is better)
 	// But this Upload endpoint accepts file. So we save it.
 	// We need to use storage provider to save it?
@@ -61,7 +55,7 @@ func (s *common) Upload(ctx context.Context, file *multipart.FileHeader, typeArg
 	url := s.GetAssetURL(objectKey)
 
 	// ... rest ...
-	t, err := models.TenantQuery.WithContext(ctx).Where(models.TenantQuery.UserID.Eq(uid)).First()
+	t, err := models.TenantQuery.WithContext(ctx).Where(models.TenantQuery.UserID.Eq(userID)).First()
 	var tid int64 = 0
 	if err == nil {
 		tid = t.ID
@@ -69,7 +63,7 @@ func (s *common) Upload(ctx context.Context, file *multipart.FileHeader, typeArg
 
 	asset := &models.MediaAsset{
 		TenantID:  tid,
-		UserID:    uid,
+		UserID:    userID,
 		Type:      consts.MediaAssetType(typeArg),
 		Status:    consts.MediaAssetStatusUploaded,
 		Provider:  "local",