Add CloudronManifest and copy logo into client assets

CloudronManifest.json

@@ -0,0 +1,11 @@
+{
+  "id": "librechat-custom",
+  "version": "1.3.1",
+  "name": "LibreChat (Co‑op custom)",
+  "description": "LibreChat sandbox with Inference‑Co‑op branding and image‑generation support.",
+  "tags": ["chat","llm"],
+  "icon": "logo-coop.png",
+  "volumes": {"data": {"path": "/app/data"}},
+  "exposablePorts": {"http": 3080},
+  "processes": {"main": "node /app/code/librechat/server/app.js"}
+}