feat: Implement image thumbnail generation, storage, and API endpoints for assets, including a regeneration utility.

api/endpoints/character_router.py

@@ -5,7 +5,7 @@ from pydantic import BaseModel
 from starlette.exceptions import HTTPException
 from starlette.requests import Request
 
-from api.models.AssetDTO import AssetsResponse
+from api.models.AssetDTO import AssetsResponse, AssetResponse
 from api.models.GenerationRequest import GenerationRequest, GenerationResponse
 from models.Asset import Asset
 from models.Character import Character
@@ -35,7 +35,9 @@ async def get_character_assets(character_id: str, dao: DAO = Depends(get_dao), l
         raise HTTPException(status_code=404, detail="Character not found")
     assets = await dao.assets.get_assets_by_char_id(character_id, limit, offset)
     total_count = await dao.assets.get_asset_count(character_id)
-    return AssetsResponse(assets=assets, total_count=total_count)
+    
+    asset_responses = [AssetResponse.model_validate(a.model_dump()) for a in assets]
+    return AssetsResponse(assets=asset_responses, total_count=total_count)
 
 
 @router.get("/{character_id}", response_model=Character)