feat: Refactor main.py into renamer directory and update script entry point in pyproject.toml

renamer/main.py

@@ -0,0 +1,14 @@
+import argparse
+from renamer.app import RenamerApp
+
+
+def main():
+    parser = argparse.ArgumentParser(description="Media file renamer")
+    parser.add_argument("directory", nargs="?", default=".", help="Directory to scan")
+    args = parser.parse_args()
+    app = RenamerApp(args.directory)
+    app.run()
+
+
+if __name__ == "__main__":
+    main()