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/butt_smother_ag_000043.json

@@ -2,7 +2,7 @@
   "action_id": "butt_smother_ag_000043",
   "action_name": "Butt Smother Ag 000043",
   "action": {
-    "full_body": "facesitting, character sitting on face, pov from below, dominant pose",
+    "full_body": "1boy,1girl,facesitting, character sitting on face, pov from below, dominant pose",
     "head": "looking down at viewer, looking back over shoulder",
     "eyes": "looking at viewer, half-closed eyes, seductive gaze",
     "arms": "arms reaching back, supporting weight",
@@ -34,4 +34,4 @@
     "suffocation",
     "submissive view"
   ]
-}
+}