feat: add RealESRGAN upscale models to configuration

Added RealESRGAN x2 and x4 upscaling models:
- RealESRGAN_x2.pth - Fast 2x upscaling
- RealESRGAN_x4.pth - High quality 4x upscaling
- Both marked as essential, minimal VRAM usage (~2-4GB)
- Total size: ~120MB combined

comfyui_models.yaml

@@ -290,6 +290,32 @@ model_categories:
         - source: "ae.safetensors"
           dest: "ae.safetensors"
 
+    - repo_id: ai-forever/Real-ESRGAN
+      description: RealESRGAN x2 - 2x upscaling model
+      size_gb: 0.06
+      essential: true
+      category: support
+      type: upscale_models
+      format: pth
+      vram_gb: 2
+      notes: Fast 2x upscaling model for general purpose enhancement
+      files:
+        - source: "RealESRGAN_x2.pth"
+          dest: "RealESRGAN_x2.pth"
+
+    - repo_id: ai-forever/Real-ESRGAN
+      description: RealESRGAN x4 - 4x upscaling model
+      size_gb: 0.06
+      essential: true
+      category: support
+      type: upscale_models
+      format: pth
+      vram_gb: 4
+      notes: High-quality 4x upscaling model for detail enhancement
+      files:
+        - source: "RealESRGAN_x4.pth"
+          dest: "RealESRGAN_x4.pth"
+
     - repo_id: stabilityai/stable-diffusion-3.5-large
       description: T5-XXL FP16 - For CogVideoX text encoding
       size_gb: 9