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/agressivechoking_000010.json

@@ -1,34 +0,0 @@
-{
-  "action_id": "agressivechoking_000010",
-  "action_name": "Agressivechoking 000010",
-  "action": {
-    "full_body": "dynamic perspective, leaning forward, dominant violent stance, POV",
-    "head": "face close to camera, angry expression, gritting teeth or shouting, heavy breathing",
-    "eyes": "intense stare, dilated pupils, furious gaze, sanpaku",
-    "arms": "extended towards viewer or subject, muscles tensed, shoulders shrugged forward",
-    "hands": "fingers curled tightly, hand around neck, strangling motion, squeezing",
-    "torso": "hunched forward, tense upper body",
-    "pelvis": "weight shifted forward",
-    "legs": "wide stance for leverage, braced",
-    "feet": "planted firmly",
-    "additional": "sweat, speed lines, depth of field, high contrast lighting, shadow over eyes"
-  },
-  "participants": {
-    "solo_focus": "true",
-    "orientation": "MF"
-  },
-  "lora": {
-    "lora_name": "Illustrious/Poses/AgressiveChoking-000010.safetensors",
-    "lora_weight": 1.0,
-    "lora_triggers": "AgressiveChoking-000010",
-    "lora_weight_min": 1.0,
-    "lora_weight_max": 1.0
-  },
-  "tags": [
-    "violence",
-    "dominance",
-    "pov",
-    "combat",
-    "anger"
-  ]
-}