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/clothing/tifalockhartff7advchilfeather_illu_dwnsty_000006.json

@@ -0,0 +1,31 @@
+{
+  "outfit_id": "tifalockhartff7advchilfeather_illu_dwnsty_000006",
+  "outfit_name": "Cosplay - Tifa Feather Dress",
+  "wardrobe": {
+    "full_body": "black_dress, strapless_dress, feather_trim",
+    "headwear": "feather_hair_ornament",
+    "top": "",
+    "bottom": "",
+    "legwear": "thighhighs",
+    "footwear": "",
+    "hands": "black_gloves, detached_sleeves",
+    "accessories": "black_feathers"
+  },
+  "lora": {
+    "lora_name": "Illustrious/Clothing/TifaLockhartFF7AdvChilFeather_Illu_Dwnsty-000006.safetensors",
+    "lora_weight": 0.8,
+    "lora_weight_min": 0.7,
+    "lora_weight_max": 1.0,
+    "lora_triggers": ""
+  },
+  "tags": [
+    "black_dress",
+    "feathers",
+    "black_feathers",
+    "detached_sleeves",
+    "black_gloves",
+    "thighhighs",
+    "feather_trim",
+    "strapless_dress"
+  ]
+}