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/looks/candycanelatexlingerieill.json

@@ -1,18 +0,0 @@
-{
-  "look_id": "candycanelatexlingerieill",
-  "look_name": "Candycanelatexlingerieill",
-  "character_id": "",
-  "positive": "latex, lingerie, red_capelet, striped_thighhighs, high_heels, garter_straps, panties, stripes, candy_cane",
-  "negative": "",
-  "lora": {
-    "lora_name": "Illustrious/Looks/candycanelatexlingerieILL.safetensors",
-    "lora_weight": 0.75,
-    "lora_triggers": "candy cane latex lingerie",
-    "lora_weight_min": 0.75,
-    "lora_weight_max": 0.75
-  },
-  "tags": [
-    "clothing",
-    "lingeriefetish"
-  ]
-}