May 19, 2026: Full harness update

- Model migration: gemma-4-E4B → qwen3.5-9b-vlm
- Dashboard reorder: Usage Over Time + GPU Metrics to top
- Router counter leak fix (gpu_decr in except handler)
- VLM slot upgrade 1→2
- Redis stale key cleanup
- Automated maintenance cron job
- LiteLLM config update
- GPU router config update
- README update

litellm_config.yaml

@@ -11,9 +11,9 @@ model_list:
       api_base: http://192.168.68.8:8080/v1
       api_key: "not-needed"
 
-  - model_name: gemma-4-E4B
+  - model_name: qwen3.5-9b-vlm
     litellm_params:
-      model: openai/gemma-4-E4B
+      model: openai/qwen3.5-9b-vlm
       api_base: http://192.168.68.110:8080/v1
       api_key: "not-needed"