Validate base model exists before adding LoRA to model list

- When --update-models detects a LoRA adapter, validate that the base
  model exists on HuggingFace before adding it to the model list
- Skip LoRAs whose base models are not found on HuggingFace
- Added support for flux and sdxl base model detection
- Print informative messages when skipping LoRAs with missing base models

videogen

@@ -1367,6 +1367,19 @@ def update_all_models(hf_token=None):
                     base_model = "Wan-AI/Wan2.1-I2V-14B-Diffusers" if m["is_i2v"] else "Wan-AI/Wan2.1-T2V-14B-Diffusers"
                 elif "svd" in model_id.lower() or "stable-video" in model_id.lower():
                     base_model = "stabilityai/stable-video-diffusion-img2vid-xt-1-1"
+                elif "flux" in model_id.lower():
+                    base_model = "black-forest-labs/FLUX.1-dev"
+                elif "sdxl" in model_id.lower() or "xl" in model_id.lower():
+                    base_model = "stabilityai/stable-diffusion-xl-base-1.0"
+                
+                # Validate that the base model exists on HuggingFace
+                if base_model:
+                    base_model_info = validate_hf_model(base_model, hf_token=hf_token)
+                    if not base_model_info:
+                        print(f"  ⏭️  Skipping LoRA {model_id} - base model not found: {base_model}")
+                        continue
+                    else:
+                        print(f"  📦 LoRA detected: {model_id} (base: {base_model})")
             
             # Build model entry
             model_entry = {
@@ -1455,6 +1468,19 @@ def update_all_models(hf_token=None):
                     base_model = "Wan-AI/Wan2.1-I2V-14B-Diffusers" if m["is_i2v"] else "Wan-AI/Wan2.1-T2V-14B-Diffusers"
                 elif "svd" in model_id.lower() or "stable-video" in model_id.lower():
                     base_model = "stabilityai/stable-video-diffusion-img2vid-xt-1-1"
+                elif "flux" in model_id.lower():
+                    base_model = "black-forest-labs/FLUX.1-dev"
+                elif "sdxl" in model_id.lower() or "xl" in model_id.lower():
+                    base_model = "stabilityai/stable-diffusion-xl-base-1.0"
+                
+                # Validate that the base model exists on HuggingFace
+                if base_model:
+                    base_model_info = validate_hf_model(base_model, hf_token=hf_token)
+                    if not base_model_info:
+                        print(f"  ⏭️  Skipping LoRA {model_id} - base model not found: {base_model}")
+                        continue
+                    else:
+                        print(f"  📦 LoRA detected: {model_id} (base: {base_model})")
             
             # Build model entry
             model_entry = {