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/characters/becky_blackbell.json

@@ -0,0 +1,61 @@
+{
+  "character_id": "becky_blackbell",
+  "character_name": "Becky Blackbell",
+  "identity": {
+    "base_specs": "becky_blackbell, 1girl, loli",
+    "hair": "brown_hair, short_hair, twintails",
+    "eyes": "brown_eyes",
+    "hands": "",
+    "arms": "",
+    "torso": "",
+    "pelvis": "",
+    "legs": "",
+    "feet": "",
+    "extra": ""
+  },
+  "defaults": {
+    "expression": "",
+    "pose": "",
+    "scene": ""
+  },
+  "wardrobe": {
+    "full_body": "eden_academy_school_uniform,gold_trim",
+    "headwear": "hair_ornament",
+    "top": " black_dress, ",
+    "bottom": "",
+    "legwear": "white_socks",
+    "footwear": "loafers",
+    "hands": "",
+    "accessories": ""
+  },
+  "styles": {
+    "aesthetic": "anime_style",
+    "primary_color": "black",
+    "secondary_color": "gold",
+    "tertiary_color": "white"
+  },
+  "lora": {
+    "lora_name": "",
+    "lora_weight": 1.0,
+    "lora_weight_min": 0.7,
+    "lora_weight_max": 1.0,
+    "lora_triggers": ""
+  },
+  "tags": [
+    "becky_blackbell",
+    "spy_x_family",
+    "1girl",
+    "solo",
+    "brown_hair",
+    "twintails",
+    "brown_eyes",
+    "eden_academy_school_uniform",
+    "black_dress",
+    "gold_trim",
+    "white_socks",
+    "loafers",
+    "hair_ornament",
+    "short_hair",
+    "child"
+  ]
+}