image gen: restore per-member billing (customUserVars + env IC_API_KEY); keep system key as safety-net fallback only

librechat.yaml

@@ -179,7 +179,11 @@ mcpServers:
     # Per-user credentials aren't available at boot; each member initializes
     # their own connection after saving their key in the MCP panel.
     startup: false
-    # Images bill to the co-op system key (SYSTEM_IMAGE_KEY) — no per-user
-    # credential gate, so a brand-new member can generate immediately.
+    customUserVars:
+      IC_API_KEY:
+        title: "Inference Co-op API key"
+        description: "Auto-loaded from your membership — no action needed."
+        sensitive: true
     env:
+      IC_API_KEY: "{{IC_API_KEY}}"
       SYSTEM_IMAGE_KEY: "${SYSTEM_IMAGE_KEY}"