store ComfyUI configs in repo for one-command pod rebuild

- comfyui/: extra_model_paths.yaml + the three MiniMax H3 workflow JSONs
- push-to-pod.sh stages everything onto the persistent volume
- install-minimax-h3.sh rebuilds a wiped container from that stage

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

comfyui/extra_model_paths.yaml

@@ -0,0 +1,7 @@
+# ComfyUI extra model paths — points at the RunPod network volume (1 TB) where
+# all MiniMax H3 weights live. Install to /ComfyUI/extra_model_paths.yaml
+minimax_workspace:
+  base_path: /workspace/minimax-h3/models
+  diffusion_models: diffusion_models
+  text_encoders: text_encoders
+  vae: vae