Add httpPort to CloudronManifest

CloudronManifest.json

@@ -6,7 +6,7 @@
   "description": "LibreChat sandbox with Inference‑Co‑op branding and image‑generation support.",
   "tags": ["chat","llm"],
   "icon": "logo-coop.png",
+  "httpPort": 3080,
   "volumes": {"data": {"path": "/app/data"}},
-  "exposablePorts": {"http": 3080},
   "processes": {"main": "node /app/code/librechat/server/app.js"}
 }