feat: Authors feature backend (and upgraded deprecated mods)

internal/domain/author/authorRepositoryInterface.go

@@ -0,0 +1,16 @@
+package author
+
+type Repository interface {
+	List(query ListQuery) (Page, error)
+	Get(id uint32) (Author, error)
+	GetBySlug(slug string) (Author, error)
+	GetByUserID(userID uint32) (Author, error)
+	Create(author Author) (Author, error)
+	Update(author Author) (Author, error)
+	DeleteMovingCredits(id uint32, reassignTo *uint32) error
+	DeleteUncrediting(id uint32) error
+	AvatarUsage() (map[uint32]int, error)
+	ClearAvatar(imageID uint32) ([]uint32, error)
+	AssignAvatar(authorIDs []uint32, imageID uint32) error
+	RepointAvatar(fromImageIDs []uint32, toImageID uint32) (int, error)
+}