fix: replace custom Pivoine node with direct DiffRhythm patch

- Remove custom PivoineDiffRhythmRun wrapper node
- Add git patch file for ComfyUI_DiffRhythm __init__.py
- Patch adds LlamaConfig fix at import time
- Add arty script 'fix/diffrhythm-patch' to apply patch
- Revert all workflows to use original DiffRhythmRun
- Remove startup_patch.py and revert start.sh

This approach is cleaner and more maintainable than wrapping the node.
The patch directly fixes the tensor dimension mismatch (32 vs 64) in
DiffRhythm's rotary position embeddings by ensuring num_attention_heads
and num_key_value_heads are properly set based on hidden_size.

References:
- https://github.com/billwuhao/ComfyUI_DiffRhythm/issues/44
- https://github.com/billwuhao/ComfyUI_DiffRhythm/issues/48

arty.yml

@@ -396,37 +396,56 @@ scripts:
     echo ""
     echo "Category: 🌸Pivoine/Audio"
 
-  fix/diffrhythm-transformers: |
+  fix/diffrhythm-patch: |
     echo "========================================="
-    echo "  Fix DiffRhythm Transformers Version"
+    echo "  Apply DiffRhythm LlamaConfig Patch"
     echo "========================================="
     echo ""
     echo "Issue: Tensor dimension mismatch (32 vs 64) in rotary embeddings"
-    echo "Solution: Downgrade transformers to 4.49.0"
+    echo "Solution: Patch DiffRhythm __init__.py to fix LlamaConfig"
     echo ""
     echo "References:"
     echo "  - https://github.com/billwuhao/ComfyUI_DiffRhythm/issues/44"
     echo "  - https://github.com/billwuhao/ComfyUI_DiffRhythm/issues/48"
     echo ""
 
-    cd /workspace/ComfyUI
-    source venv/bin/activate
+    DIFF_RHYTHM_DIR="/workspace/ComfyUI/custom_nodes/ComfyUI_DiffRhythm"
+    PATCH_FILE="/workspace/ai/comfyui/patches/diffrhythm-llamaconfig-fix.patch"
 
-    echo "Current transformers version:"
-    pip show transformers | grep Version
-    echo ""
+    if [ ! -d "$DIFF_RHYTHM_DIR" ]; then
+      echo "✗ Error: DiffRhythm not found at $DIFF_RHYTHM_DIR"
+      exit 1
+    fi
 
-    echo "Installing transformers==4.49.0..."
-    pip install transformers==4.49.0
+    if [ ! -f "$PATCH_FILE" ]; then
+      echo "✗ Error: Patch file not found at $PATCH_FILE"
+      exit 1
+    fi
 
-    echo ""
-    echo "✓ Transformers downgraded to 4.49.0"
-    echo ""
-    echo "Next steps:"
-    echo "  1. Restart ComfyUI: arty services/comfyui/restart"
-    echo "  2. Test DiffRhythm workflows"
+    cd "$DIFF_RHYTHM_DIR"
 
-    deactivate
+    echo "Checking if patch already applied..."
+    if grep -q "PatchedLlamaConfig" __init__.py; then
+      echo "✓ Patch already applied!"
+      exit 0
+    fi
+
+    echo "Applying patch..."
+    patch -p1 < "$PATCH_FILE"
+
+    if [ $? -eq 0 ]; then
+      echo ""
+      echo "✓ Patch applied successfully!"
+      echo ""
+      echo "Next steps:"
+      echo "  1. Restart ComfyUI: arty services/comfyui/restart"
+      echo "  2. Test DiffRhythm workflows"
+    else
+      echo ""
+      echo "✗ Failed to apply patch"
+      echo "You may need to manually apply the patch or check for conflicts"
+      exit 1
+    fi
 
   setup/comfyui-extensions-deps: |
     echo "========================================="