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/clothing/bikini_02.json

@@ -1,10 +1,10 @@
 {
-  "outfit_id": "bikini_02",
-  "outfit_name": "Bikini (Slingshot)",
+  "outfit_id": "swimsuit_slingshot",
+  "outfit_name": "Swimsuit - Slingshot",
   "wardrobe": {
-    "full_body": "",
+    "full_body": "slingshot swimsuit",
     "headwear": "",
-    "top": "slingshot swimsuit",
+    "top": "",
     "bottom": "",
     "legwear": "",
     "footwear": "",
@@ -25,4 +25,4 @@
     "navel",
     "revealing clothes"
   ]
-}
+}