feat(photos): add square medium variant for sharp grid thumbnails

backend/internal/models/models.go

@@ -32,8 +32,10 @@ type Album struct {
 	Title         string    `json:"title"`
 	Description   string    `json:"description"`
 	CoverPhotoID  *string   `json:"cover_photo_id,omitempty"`
-	CoverThumbKey string    `json:"-"`
-	CoverThumbURL string    `json:"cover_thumb_url,omitempty"`
+	CoverThumbKey  string `json:"-"`
+	CoverThumbURL  string `json:"cover_thumb_url,omitempty"`
+	CoverMediumKey string `json:"-"`
+	CoverMediumURL string `json:"cover_medium_url,omitempty"`
 	PhotosCount   int       `json:"photos_count"`
 	MembersCount  int       `json:"members_count"`
 	CreatedAt     time.Time `json:"created_at"`
@@ -67,6 +69,7 @@ type Photo struct {
 	UploaderID       string     `json:"uploader_id"`
 	StorageKey       string     `json:"-"`
 	ThumbKey         string     `json:"-"`
+	MediumKey        string     `json:"-"`
 	PreviewKey       string     `json:"-"`
 	OriginalFilename string     `json:"original_filename"`
 	Size             int64      `json:"size"`
@@ -87,6 +90,7 @@ type Photo struct {
 	CommentsCount    int        `json:"comments_count"`
 	LikedByMe        bool       `json:"liked_by_me"`
 	ThumbURL         string     `json:"thumb_url,omitempty"`
+	MediumURL        string     `json:"medium_url,omitempty"`
 	PreviewURL       string     `json:"preview_url,omitempty"`
 	OriginalURL      string     `json:"original_url,omitempty"`
 	DownloadURL      string     `json:"download_url,omitempty"`