feat: enforce output version v1 and add version subcommand

tests/cli_parse_tests.rs

@@ -26,3 +26,12 @@ fn parse_render_md_requires_input() {
         _ => panic!("expected render-md"),
     }
 }
+
+#[test]
+fn parse_version_subcommand() {
+    let cli = Cli::try_parse_from(["gitea-pr-review", "version"]).unwrap();
+    match cli.command {
+        Commands::Version => {}
+        _ => panic!("expected version"),
+    }
+}