fix: update batch pipeline to use SDXL instead of FLUX

Changed checkpoint from FLUX.1-schnell to sd_xl_base_1.0.safetensors
to match available models. Also updated sampling parameters for SDXL:
- Steps: 4 → 20 (SDXL needs more steps)
- CFG: 1.0 → 7.0 (standard for SDXL)

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

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

models/comfyui/workflows/advanced/batch-pipeline-production-v1.json

@@ -11,8 +11,8 @@
       "order": 0,
       "mode": 0,
       "properties": {"Node name for S&R": "CheckpointLoaderSimple"},
-      "widgets_values": ["diffusers/FLUX.1-schnell"],
-      "title": "FLUX Schnell Loader",
+      "widgets_values": ["sd_xl_base_1.0.safetensors"],
+      "title": "SDXL Base Loader",
       "outputs": [
         {"name": "MODEL", "type": "MODEL", "links": [1], "slot_index": 0},
         {"name": "CLIP", "type": "CLIP", "links": [2, 3], "slot_index": 1},
@@ -79,7 +79,7 @@
       "order": 4,
       "mode": 0,
       "properties": {"Node name for S&R": "KSampler"},
-      "widgets_values": [42, "fixed", 4, 1.0, "euler", "normal", 1],
+      "widgets_values": [42, "fixed", 20, 7.0, "euler", "normal", 1],
       "title": "Batch Sampler (4 variations)",
       "inputs": [
         {"name": "model", "type": "MODEL", "link": 1},
@@ -157,7 +157,7 @@
     "workflow_info": {
       "name": "Batch Pipeline Production",
       "version": "1.0.0",
-      "description": "Batch generation pipeline for multiple variations. Generate 4 images simultaneously with different seeds for rapid iteration using FLUX.1-schnell.",
+      "description": "Batch generation pipeline for multiple variations. Generate 4 images simultaneously with different seeds for rapid iteration using Stable Diffusion XL.",
       "category": "advanced",
       "tags": [
         "batch",
@@ -168,7 +168,7 @@
         "flux"
       ],
       "requirements": {
-        "models": ["FLUX.1-schnell"],
+        "models": ["stable-diffusion-xl-base-1.0"],
         "custom_nodes": [],
         "vram_min": "20GB",
         "vram_recommended": "24GB"
@@ -215,10 +215,10 @@
           "widget_index": 2,
           "type": "integer",
           "required": false,
-          "default": 4,
-          "min": 1,
-          "max": 10,
-          "description": "Number of sampling steps (4 recommended for FLUX Schnell)"
+          "default": 20,
+          "min": 15,
+          "max": 50,
+          "description": "Number of sampling steps (20-30 recommended for SDXL)"
         }
       },
       "outputs": {
@@ -231,7 +231,7 @@
         }
       },
       "performance": {
-        "avg_generation_time": "15-25 seconds for 4 images (4 steps)",
+        "avg_generation_time": "45-60 seconds for 4 images (20 steps)",
         "vram_usage": "~20-24GB (depends on batch size)",
         "gpu_utilization": "95-100%"
       },