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>

data/characters/starfire_teen_titans.json

@@ -0,0 +1,64 @@
+{
+  "character_id": "starfire_teen_titans",
+  "character_name": "Starfire - Teen Titans",
+  "identity": {
+    "base_specs": "1girl, tall, athletic",
+    "hair": "red_hair, long_hair",
+    "eyes": "green_eyes",
+    "hands": "",
+    "arms": "armlet, vambraces",
+    "torso": "small_breasts, crop_top",
+    "pelvis": "grey_belt",
+    "legs": "pencil_skirt",
+    "feet": "thigh_boots, purple_boots",
+    "extra": "gorget"
+  },
+  "defaults": {
+    "expression": "smile",
+    "pose": "hovering",
+    "scene": "starry sky"
+  },
+  "wardrobe": {
+    "full_body": "",
+    "headwear": "",
+    "top": "crop_top",
+    "bottom": "purple_skirt",
+    "legwear": "",
+    "footwear": "thigh_boots, purple_boots",
+    "hands": "vambraces",
+    "accessories": "gorget, grey_belt, armlet"
+  },
+  "styles": {
+    "aesthetic": "cartoon, superhero",
+    "primary_color": "purple",
+    "secondary_color": "red",
+    "tertiary_color": "green"
+  },
+  "lora": {
+    "lora_name": "Illustrious/Looks/Starfire IL.safetensors",
+    "lora_weight": 0.8,
+    "lora_triggers": "starfiredc",
+    "lora_weight_min": 0.8,
+    "lora_weight_max": 0.8
+  },
+  "tags": [
+    "1girl",
+    "starfire",
+    "green_eyes",
+    "red_hair",
+    "long_hair",
+    "small_breasts",
+    "gorget",
+    "crop_top",
+    "armlet",
+    "pencil_skirt",
+    "purple_skirt",
+    "grey_belt",
+    "thigh_boots",
+    "vambraces",
+    "purple_boots",
+    "looking_at_viewer",
+    "smile",
+    "teen_titans"
+  ]
+}