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/detailers/sts_age_slider_illustrious_v1.json

@@ -1,12 +1,12 @@
 {
   "detailer_id": "sts_age_slider_illustrious_v1",
   "detailer_name": "Sts Age Slider Illustrious V1",
-  "prompt": "mature_female, petite, aged_up, aged_down",
   "lora": {
     "lora_name": "Illustrious/Detailers/StS_Age_Slider_Illustrious_v1.safetensors",
-    "lora_weight": 1.0,
-    "lora_weight_min": -5.0,
-    "lora_weight_max": 5.0,
-    "lora_triggers": "StS_Age_Slider_Illustrious_v1"
-  }
+    "lora_triggers": "StS_Age_Slider_Illustrious_v1",
+    "lora_weight": 1,
+    "lora_weight_max": -5,
+    "lora_weight_min": -5
+  },
+  "prompt": "loli, child, young, small"
 }