Enhance NVIDIA API key handling and options

Added NVIDIA_API_KEYS export and updated NODE_OPTIONS.

start.sh

@@ -108,7 +108,8 @@ case "$LLM_PROVIDER" in
   # ── Western Providers ──
   mistral|mistralai)            export MISTRAL_API_KEY="$LLM_API_KEY" ;;
   xai|x-ai)                    export XAI_API_KEY="$LLM_API_KEY" ;;
-  nvidia)                       export NVIDIA_API_KEY="$LLM_API_KEY" ;;
+  nvidia)                       export NVIDIA_API_KEY="$LLM_API_KEY"
+                                export NVIDIA_API_KEYS="${NVIDIA_API_KEYS:-$LLM_API_KEY}";;
   cohere)                       export COHERE_API_KEY="$LLM_API_KEY" ;;
   groq)                         export GROQ_API_KEY="$LLM_API_KEY" ;;
   together)                     export TOGETHER_API_KEY="$LLM_API_KEY" ;;
@@ -425,7 +426,7 @@ chmod 600 /home/node/.openclaw/openclaw.json
 
 # ── Enable Gateway Preload Fixes ──
 # This preload script keeps iframe embedding working on HF Spaces.
-export NODE_OPTIONS="${NODE_OPTIONS:+$NODE_OPTIONS }--require /home/node/app/iframe-fix.cjs"
+export NODE_OPTIONS="${NODE_OPTIONS:+$NODE_OPTIONS }--require /home/node/app/iframe-fix.cjs --require /home/node/app/nvidia-key-rotator.cjs"
 
 # ── Startup Summary ──
 echo ""
@@ -497,6 +498,7 @@ warmup_browser() {
   ) &
 }
 
+
 # ── Start background services ──
 export LLM_MODEL="$LLM_MODEL"
 # 10. Start Health Server & Dashboard