build: PaddedCell-style install.mjs + SDK-aligned packaging

install.mjs (--install/--build-only/--uninstall/--openclaw-profile-path),
tsconfig outDir dist/fabric, package.json openclaw file dep + main.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

node_modules/socket.io-client/build/esm/on.js

@@ -0,0 +1,6 @@
+export function on(obj, ev, fn) {
+    obj.on(ev, fn);
+    return function subDestroy() {
+        obj.off(ev, fn);
+    };
+}