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/hulkenbergmr_illu_bsinky_v1.json

@@ -1,8 +1,8 @@
 {
   "look_id": "hulkenbergmr_illu_bsinky_v1",
   "look_name": "Hulkenbergmr Illu Bsinky V1",
-  "character_id": "",
-  "positive": "metaphor:_refantazio, 1girl, red_hair, long_hair, blunt_bangs, sidelocks, aqua_eyes, v-shaped_eyebrows, pointy_ears, white_ascot, cleavage, breastplate, black_armor, black_capelet, high-waist_pants, blue_pants, long_sleeves, blue_sleeves, black_gloves, high_heel_boots, ankle_boots, brown_boots, halberd",
+  "character_id": null,
+  "positive": "metaphor:_refantazio, 1girl, red_hair, long_hair, blunt_bangs, sidelocks, aqua_eyes, v-shaped_eyebrows, pointy_ears, white_ascot, cleavage, breastplate, black_armor, black_capelet, high-waist_pants, dark navy_pants, long_sleeves, dark navy_sleeves, black_gloves, high_heel_boots, ankle_boots, brown_boots, halberd",
   "negative": "black_bodysuit, frills, black_jacket, cropped_jacket, choker, lowres, bad_anatomy, bad_hands",
   "lora": {
     "lora_name": "Illustrious/Looks/HulkenbergMR-illu-bsinky-v1.safetensors",
@@ -36,4 +36,4 @@
     "brown_boots",
     "halberd"
   ]
-}
+}