fix: correct SVN URL path for WordPress.org theme versions (fix: #25) (#33)

Themes should reference versions directly (e.g., 1.4.5/) not through a
tags subdirectory (e.g., tags/1.4.5/). This matches the actual SVN structure
at https://themes.svn.wordpress.org/

The fix applies the correct reference format only for themes, maintaining
the existing tags/ structure for plugins, which is correct for those packages.

Author: SteelWagstaff

internal/repository/composer.go

@@ -24,6 +24,9 @@ func ComposerVersion(pkgType, slug, ver, downloadURL string, meta PackageMeta) m
 	}
 
 	ref := fmt.Sprintf("tags/%s", ver)
+	if pkgType == "theme" {
+		ref = ver
+	}
 	if ver == "dev-trunk" {
 		ref = "trunk"
 	}