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/blossom_ppg.json

@@ -0,0 +1,61 @@
+{
+  "character_id": "blossom_ppg",
+  "character_name": "Blossom",
+  "identity": {
+    "base_specs": "blossom_(ppg), 1girl, mature_female, slender, fair_skin",
+    "hair": "orange_hair, very_long_hair, high_ponytail, blunt_bangs",
+    "eyes": "pink_eyes, eyelashes",
+    "hands": "",
+    "arms": "",
+    "torso": "slender_waist",
+    "pelvis": "",
+    "legs": "",
+    "feet": "",
+    "extra": ""
+  },
+  "defaults": {
+    "expression": "smile, confident",
+    "pose": "standing, hand_on_hip",
+    "scene": "city_skyline, day"
+  },
+  "wardrobe": {
+    "full_body": "pink_dress, sleeveless_dress, A-line_dress",
+    "headwear": "red_bow, hair_bow",
+    "top": "",
+    "bottom": "",
+    "legwear": "white_leggings, white_tights",
+    "footwear": "black_footwear, mary_janes",
+    "hands": "",
+    "accessories": "black_belt"
+  },
+  "styles": {
+    "aesthetic": "modern_cartoon, vibrant_colors",
+    "primary_color": "pink",
+    "secondary_color": "red",
+    "tertiary_color": "black"
+  },
+  "lora": {
+    "lora_name": "Illustrious/Looks/Aged_up_Powerpuff_Girls.safetensors",
+    "lora_weight": 1.0,
+    "lora_weight_min": 0.7,
+    "lora_weight_max": 1.0,
+    "lora_triggers": ""
+  },
+  "tags": [
+    "1girl",
+    "mature_female",
+    "orange_hair",
+    "very_long_hair",
+    "high_ponytail",
+    "pink_eyes",
+    "hair_bow",
+    "red_bow",
+    "pink_dress",
+    "sleeveless_dress",
+    "black_belt",
+    "white_leggings",
+    "mary_janes",
+    "powerpuff_girls",
+    "aged_up"
+  ]
+}