feat: Add texture rendering endpoints and service methods

- Introduced new API endpoints for rendering textures, avatars, capes, and previews, enhancing the texture handling capabilities.
- Implemented corresponding service methods in the TextureHandler to process rendering requests and return appropriate responses.
- Updated the TextureRenderService interface to include methods for rendering textures, avatars, and capes, along with their respective parameters.
- Enhanced error handling for invalid texture IDs and added support for different rendering types and formats.
- Updated go.mod to include the webp library for image processing.

internal/service/mocks_test.go

@@ -315,6 +315,18 @@ func (m *MockTextureRepository) FindByHash(ctx context.Context, hash string) (*m
 	return nil, nil
 }
 
+func (m *MockTextureRepository) FindByHashAndUploaderID(ctx context.Context, hash string, uploaderID int64) (*model.Texture, error) {
+	if m.FailFind {
+		return nil, errors.New("mock find error")
+	}
+	for _, texture := range m.textures {
+		if texture.Hash == hash && texture.UploaderID == uploaderID {
+			return texture, nil
+		}
+	}
+	return nil, nil
+}
+
 func (m *MockTextureRepository) FindByUploaderID(ctx context.Context, uploaderID int64, page, pageSize int) ([]*model.Texture, int64, error) {
 	if m.FailFind {
 		return nil, 0, errors.New("mock find error")