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/jasmine_disney.json

@@ -37,7 +37,7 @@
     "tertiary_color": "black"
   },
   "lora": {
-    "lora_name": "Illustrious/Looks/Jasmine-IL_V2.safetensors",
+    "lora_name": "Illustrious/Looks/JasmineIL.safetensors",
     "lora_weight": 0.8,
     "lora_triggers": "",
     "lora_weight_min": 0.8,
@@ -48,4 +48,4 @@
     "princess",
     "disney"
   ]
-}
+}