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/beardy_man_ilxl_000003.json

@@ -1,16 +1,16 @@
 {
+  "character_id": null,
   "look_id": "beardy_man_ilxl_000003",
   "look_name": "Beardy Man Ilxl 000003",
-  "character_id": "",
-  "positive": "1boy, mature_male, beard, facial_hair, solo",
-  "negative": "1girl, female",
   "lora": {
     "lora_name": "Illustrious/Looks/beardy-man-ilxl-000003.safetensors",
     "lora_weight": 0.8,
     "lora_triggers": "beard",
-    "lora_weight_min": 0.8,
-    "lora_weight_max": 0.8
+    "lora_weight_min": 0.5,
+    "lora_weight_max": 0.7
   },
+  "negative": "1girl, female, asian, muscular",
+  "positive": "1boy, beard, facial_hair,",
   "tags": [
     "1boy",
     "mature_male",
@@ -18,4 +18,4 @@
     "facial_hair",
     "solo"
   ]
-}
+}