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/engine.io-client/build/cjs/transports/webtransport.d.ts

@@ -0,0 +1,18 @@
+import { Transport } from "../transport.js";
+import { Packet } from "engine.io-parser";
+/**
+ * WebTransport transport based on the built-in `WebTransport` object.
+ *
+ * Usage: browser, Node.js (with the `@fails-components/webtransport` package)
+ *
+ * @see https://developer.mozilla.org/en-US/docs/Web/API/WebTransport
+ * @see https://caniuse.com/webtransport
+ */
+export declare class WT extends Transport {
+    private _transport;
+    private _writer;
+    get name(): string;
+    protected doOpen(): this;
+    protected write(packets: Packet[]): void;
+    protected doClose(): void;
+}