Add outfit gallery and AI-powered creation for characters and outfits

- Add outfit gallery with CRUD operations (create, read, update, delete)
- Add AI-powered profile generation for both characters and outfits
- Add toggle to switch between AI generation and manual creation
- Auto-generate filenames from names with incrementing for duplicates
- Add 'full_body' and 'bottom' fields to wardrobe structure
- Update all character and outfit JSON files with new wardrobe fields
- Reorganize data into data/characters and data/clothing directories
- Update README with new features and JSON structure documentation

data/characters/gold_city.json

@@ -0,0 +1,47 @@
+{
+  "character_id": "gold_city_(Umamusume)",
+  "character_name": "Gold City",
+  "identity": {
+    "base_specs": "1girl, horse ears, horse tail, tall",
+    "hair": "blonde hair, wavy hair",
+    "eyes": "blue eyes",
+    "hands": "",
+    "arms": "",
+    "torso": "medium breasts",
+    "pelvis": "",
+    "legs": "",
+    "feet": "",
+    "extra": ""
+  },
+  "defaults": {
+    "expression": "bored",
+    "pose": "looking at phone",
+    "scene": "sitting on bench"
+  },
+  "wardrobe": {
+    "default": {
+      "full_body": "tracen school uniform",
+      "headwear": "",
+      "top": "",
+      "bottom": "",
+      "legwear": "",
+      "footwear": "heeled shoes",
+      "hands": "",
+      "accessories": "choker, earrings"
+    }
+  },
+  "styles": {
+    "aesthetic": "modeling,school yard",
+    "primary_color": "gold",
+    "secondary_color": "white",
+    "tertiary_color": "black"
+  },
+  "lora": {
+    "lora_name": "",
+    "lora_weight": 1.0,
+    "lora_triggers": ""
+  },
+  "tags": [
+    "Umamusume"
+  ]
+}