Add extra prompts, endless generation, random character default, and small fixes

- Add extra positive/negative prompt textareas to all 9 detail pages with session persistence
- Add Endless generation button to all detail pages (continuous preview generation until stopped)
- Default character selector to "Random Character" on all secondary detail pages
- Fix queue clear endpoint (remove spurious auth check)
- Refactor app.py into routes/ and services/ modules
- Update CLAUDE.md with new architecture documentation
- Various data file updates and cleanup

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

services/file_io.py

@@ -0,0 +1,66 @@
+import os
+from models import Settings, Character, Look
+from utils import _LORA_DEFAULTS
+
+
+def get_available_loras(category):
+    """Return sorted list of LoRA paths for the given category.
+    category: one of 'characters','outfits','actions','styles','scenes','detailers'
+    """
+    settings = Settings.query.first()
+    lora_dir = (getattr(settings, f'lora_dir_{category}', None) if settings else None) or _LORA_DEFAULTS.get(category, '')
+    if not lora_dir or not os.path.isdir(lora_dir):
+        return []
+    subfolder = os.path.basename(lora_dir.rstrip('/'))
+    return sorted(f"Illustrious/{subfolder}/{f}" for f in os.listdir(lora_dir) if f.endswith('.safetensors'))
+
+
+def get_available_checkpoints():
+    settings = Settings.query.first()
+    checkpoint_dirs_str = (settings.checkpoint_dirs if settings else None) or \
+        '/ImageModels/Stable-diffusion/Illustrious,/ImageModels/Stable-diffusion/Noob'
+    checkpoints = []
+    for ckpt_dir in checkpoint_dirs_str.split(','):
+        ckpt_dir = ckpt_dir.strip()
+        if not ckpt_dir or not os.path.isdir(ckpt_dir):
+            continue
+        prefix = os.path.basename(ckpt_dir.rstrip('/'))
+        for f in os.listdir(ckpt_dir):
+            if f.endswith('.safetensors') or f.endswith('.ckpt'):
+                checkpoints.append(f"{prefix}/{f}")
+    return sorted(checkpoints)
+
+
+def _count_look_assignments():
+    """Return a dict mapping look_id to the count of characters it's assigned to."""
+    assignment_counts = {}
+    looks = Look.query.all()
+    for look in looks:
+        if look.character_id:
+            assignment_counts[look.look_id] = 1
+        else:
+            assignment_counts[look.look_id] = 0
+    return assignment_counts
+
+
+def _count_outfit_lora_assignments():
+    """Return a dict mapping outfit LoRA filename to the count of characters using it."""
+    assignment_counts = {}
+    characters = Character.query.all()
+
+    for character in characters:
+        char_lora = character.data.get('lora', {}).get('lora_name', '')
+        if char_lora and 'Clothing' in char_lora:
+            assignment_counts[char_lora] = assignment_counts.get(char_lora, 0) + 1
+
+        wardrobe = character.data.get('wardrobe', {})
+        if 'default' in wardrobe and isinstance(wardrobe.get('default'), dict):
+            for outfit_name, outfit_data in wardrobe.items():
+                if isinstance(outfit_data, dict):
+                    outfit_lora = outfit_data.get('lora', {})
+                    if isinstance(outfit_lora, dict):
+                        lora_name = outfit_lora.get('lora_name', '')
+                        if lora_name:
+                            assignment_counts[lora_name] = assignment_counts.get(lora_name, 0) + 1
+
+    return assignment_counts