fix: restore bun runners for dev scripts

scripts/gateway-watch.mjs

@@ -1,53 +0,0 @@
-#!/usr/bin/env node
-import { spawn } from "node:child_process";
-import { existsSync } from "node:fs";
-import { setTimeout as delay } from "node:timers/promises";
-import process from "node:process";
-
-const args = process.argv.slice(2);
-const env = { ...process.env };
-const cwd = process.cwd();
-
-const tsc = spawn("pnpm", ["exec", "tsc", "--watch", "--preserveWatchOutput"], {
-  cwd,
-  env,
-  stdio: "inherit",
-});
-
-let nodeProcess = null;
-let exiting = false;
-
-async function waitForEntry() {
-  while (!existsSync("dist/entry.js")) {
-    if (exiting) return;
-    await delay(200);
-  }
-}
-
-function startNode() {
-  nodeProcess = spawn(process.execPath, ["--watch", "dist/entry.js", ...args], {
-    cwd,
-    env,
-    stdio: "inherit",
-  });
-}
-
-function cleanup(code = 0) {
-  if (exiting) return;
-  exiting = true;
-  nodeProcess?.kill("SIGTERM");
-  tsc.kill("SIGTERM");
-  process.exit(code);
-}
-
-process.on("SIGINT", () => cleanup(130));
-process.on("SIGTERM", () => cleanup(143));
-process.on("exit", () => cleanup());
-
-tsc.on("exit", (code) => {
-  if (exiting) return;
-  cleanup(code ?? 1);
-});
-
-await waitForEntry();
-if (!exiting) startNode();