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/actions/cof.json

@@ -2,7 +2,7 @@
   "action_id": "cof",
   "action_name": "Cum on Figure",
   "action": {
-    "full_body": "figurine, mini-girl",
+    "full_body": "figurine, mini-girl, cum on body, cum on figurine",
     "head": "",
     "eyes": "",
     "arms": "",
@@ -11,7 +11,7 @@
     "pelvis": "",
     "legs": "",
     "feet": "",
-    "additional": "cum, cum on body, excessive cum, cum on face, cum on breasts, cum on chest"
+    "additional": "cum,excessive cum,"
   },
   "participants": {
     "solo_focus": "true",
@@ -25,11 +25,7 @@
     "lora_weight_max": 1.0
   },
   "tags": [
-    "standing force",
-    "carry on front",
-    "carry",
-    "lifting",
-    "legs wrapped",
-    "straddling"
+    "cum",
+    "figurine"
   ]
-}
+}