fix(server): resolve socket.io deps via NODE_PATH + polyfill AsyncLocalStorage

Two runtime defects in the crm-app prod image (never exercised before this
deploy; CI only builds + pushes):

1. Replacing the standalone node_modules wholesale to add socket.io's deps
   swapped out Next's standalone-tuned `next` and broke its runtime
   ("Invariant: AsyncLocalStorage accessed in runtime where it is not
   available"). Instead, stage the complete hoisted prod tree in a separate
   dir on NODE_PATH: the standalone node_modules (and its `next`) stay
   intact, and only the socket server's otherwise-missing deps
   (engine.io→accepts/ws/cors, @socket.io/redis-adapter) fall through to it.

2. Defensively set globalThis.AsyncLocalStorage before Next's app-render
   modules load, via a preamble that is the first import in server.ts.
   Next's node-environment-baseline normally sets it during the standalone
   bootstrap, but the custom server can load app-render storage first.
   Verified in the esbuild bundle that the assignment runs before
   require("next").

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/server-runtime-preamble.ts

@@ -0,0 +1,15 @@
+/**
+ * Runtime preamble — MUST stay the first import in server.ts.
+ *
+ * Next's app-render calls createAsyncLocalStorage(), which falls back to a
+ * throwing FakeAsyncLocalStorage when `globalThis.AsyncLocalStorage` is unset
+ * ("Invariant: AsyncLocalStorage accessed in runtime where it is not
+ * available", error E504). next/dist/server/node-environment-baseline sets it
+ * during Next's own standalone-server bootstrap, but our custom server
+ * (dist/server.js → server-custom.js) can load app-render storage before that
+ * runs. Set it up-front, idempotently, so the invariant can never fire.
+ */
+import { AsyncLocalStorage } from 'node:async_hooks';
+
+const g = globalThis as typeof globalThis & { AsyncLocalStorage?: unknown };
+g.AsyncLocalStorage ??= AsyncLocalStorage;

src/server.ts

@@ -9,6 +9,10 @@
  * → dist/worker.js) and this file only handles Next.js + Socket.io.
  */
 
+// Must be first: sets globalThis.AsyncLocalStorage before Next's app-render
+// modules load. See src/server-runtime-preamble.ts.
+import './server-runtime-preamble';
+
 import { createServer, type Server as HttpServer } from 'node:http';
 
 import next from 'next';