feat: Authors feature backend (and upgraded deprecated mods)

test/storage_seam_test.go

@@ -125,7 +125,7 @@ func TestStaticImagesWithNonSeekableStorage(t *testing.T) {
 
 func TestMediaSearchTreatsWildcardsLiterally(t *testing.T) {
 	db, repo, _ := newMediaPersistence(t)
-	if err := db.AutoMigrate(&models.Article{}); err != nil {
+	if err := db.AutoMigrate(&models.Article{}, &models.Author{}, &models.ArticleAuthor{}); err != nil {
 		t.Fatalf("failed to migrate: %v", err)
 	}
 	percent := createStoredImage(t, repo, "100%_done.png", pngBytes(t, 1, 1), "image/png")