Fix workflow validation errors

- Changed checkpoint name from 'diffusers/stable-diffusion-xl-base-1.0' to 'sd_xl_base_1.0.safetensors'
- Fixed IPAdapter end_at parameter from string "original" to float 1.0

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

comfyui/workflows/image-to-image/ipadapter-face-i2i-production-v1.json

@@ -14,7 +14,7 @@
         "1": 100
       },
       "widgets_values": [
-        "diffusers/stable-diffusion-xl-base-1.0"
+        "sd_xl_base_1.0.safetensors"
       ],
       "title": "SDXL Base Checkpoint Loader",
       "flags": {},