fix: add --version option to Click CLI group

- Added @click.version_option decorator to main() in commands.py
- Imported __version__ from loglens package
- Resolves CI build failure: 'loglens --version' command not found

loglens/cli/main.py

@@ -1,20 +1,4 @@
-"""Main CLI entry point."""
-
 from loglens.cli.commands import main
 
-import sys
-
-
-def main_cli() -> int:
-    """Main entry point for LogLens CLI."""
-    try:
-        return main(standalone_mode=False)
-    except SystemExit:
-        raise
-    except Exception as e:
-        print(f"Error: {e}", file=sys.stderr)
-        return 1
-
-
 if __name__ == "__main__":
-    sys.exit(main_cli())
+    main()