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/styles/futurism1llust_1549997.json

@@ -9,7 +9,7 @@
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     "lora_weight": 1.0,
     "lora_triggers": "Futurism1llust_1549997",
-    "lora_weight_min": 1.0,
-    "lora_weight_max": 1.0
+    "lora_weight_min": 0.2,
+    "lora_weight_max": 0.6
   }
 }