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/looks/starfire_il.json

@@ -1,9 +1,7 @@
 {
+  "character_id": null,
   "look_id": "starfire_il",
   "look_name": "Starfire Il",
-  "character_id": "starfire",
-  "positive": "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",
-  "negative": "lowres, bad_anatomy, bad_hands, text, error, missing_fingers, extra_digit, fewer_digits, cropped, worst_quality, low_quality, normal_quality, jpeg_artifacts, signature, watermark, username, blurry, short_hair, blue_eyes, huge_breasts",
   "lora": {
     "lora_name": "Illustrious/Looks/Starfire IL.safetensors",
     "lora_weight": 0.8,
@@ -11,10 +9,12 @@
     "lora_weight_min": 0.8,
     "lora_weight_max": 0.8
   },
+  "negative": "lowres, bad_anatomy, bad_hands, text, error, missing_fingers, extra_digit, fewer_digits, cropped, worst_quality, low_quality, normal_quality, jpeg_artifacts, signature, watermark, username, blurry, short_hair, blue_eyes, huge_breasts",
+  "positive": "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",
   "tags": [
     "anime",
     "cartoon",
     "teen_titans",
     "woman"
   ]
-}
+}