feat: add title columns and migration tracking

internal/database/helpers.go

@@ -0,0 +1,12 @@
+package database
+
+// DisplayTitle returns the English title if available, otherwise Japanese, otherwise original
+func (r GetUserWatchListRow) DisplayTitle() string {
+	if r.TitleEnglish.Valid && r.TitleEnglish.String != "" {
+		return r.TitleEnglish.String
+	}
+	if r.TitleJapanese.Valid && r.TitleJapanese.String != "" {
+		return r.TitleJapanese.String
+	}
+	return r.TitleOriginal
+}