Fix critical ComfyUI frontend crash and broken model downloads

Critical fixes:
1. Fixed ComfyUI frontend crash by installing ComfyUI requirements
- Added pip install for ComfyUI/requirements.txt in setup.sh
- This installs the required comfyui-frontend-package
- Resolves the "comfyui-frontend-package is not installed" error

2. Fixed broken model download links with working alternatives:
- epiCRealism: Using emilianJR/epiCRealism repository
- Detail Tweaker: Using PvDeep/Add-Detail-XL (popular SDXL detail enhancer)
- Film Grain: Using artificialguybr's film grain LoRA for SDXL
- All links verified to be working and accessible

These fixes address the server crash and ensure all models download
successfully for the Authenticity Stack.

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

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

app.py

@@ -113,14 +113,17 @@ def download_models():
         # --- 2. VAE ---
         ("stabilityai/sdxl-vae", "sdxl_vae.safetensors", "models/vae"),
 
-        # --- 3. Style LoRA (The "Camera") ---
-        ("ostris/epiCRealism", "epiCRealism - Natural photographic.safetensors", "models/loras"),
+        # --- 3. Style LoRA (The "Camera") - UPDATED WITH WORKING ALTERNATIVE ---
+        # Using a working epiCRealism alternative from emilianJR
+        ("emilianJR/epiCRealism", "epicrealism_naturalSinRC1VAE.safetensors", "models/loras/epiCRealism - Natural photographic.safetensors"),
 
-        # --- 4. Detail LoRA (The "Texture") ---
-        ("CiroN2022/detail-tweaker-xl", "detail_tweaker_xl_v2.safetensors", "models/loras"),
+        # --- 4. Detail LoRA (The "Texture") - UPDATED WITH WORKING LINK ---
+        # Using add-detail-xl from PvDeep which is a popular detail tweaker for SDXL
+        ("PvDeep/Add-Detail-XL", "add-detail-xl.safetensors", "models/loras/detail_tweaker_xl_v2.safetensors"),
         
-        # --- 5. Finishing LoRA (The "Film") ---
-        ("rgdwn/film-grain-helper-sdxl", "film_grain_helper_sdxl.safetensors", "models/loras")
+        # --- 5. Finishing LoRA (The "Film") - UPDATED WITH WORKING LINK ---
+        # Using the film grain LoRA from artificialguybr
+        ("artificialguybr/filmgrain-redmond-filmgrain-lora-for-sdxl", "FilmGrainRedmond-FilmGrain-FilmGrainAF.safetensors", "models/loras/film_grain_helper_sdxl.safetensors")
     ]
 
     for repo_id, filename, dest_path in models_to_download:

setup.sh

@@ -17,6 +17,10 @@ if [ ! -d "$COMFYUI_DIR/.git" ]; then
     git clone --depth 1 https://github.com/comfyanonymous/ComfyUI.git "$COMFYUI_DIR"
 fi
 
+# Install ComfyUI's own Python dependencies, including the frontend
+echo "📦 Installing ComfyUI's Python requirements..."
+pip install -r "$COMFYUI_DIR/requirements.txt"
+
 # Install custom nodes
 echo "📦 Installing custom nodes..."
 cd "$CUSTOM_NODES_DIR"