fix config

api/app/core/config.py

@@ -1,4 +1,6 @@
 """Application configuration"""
+import os
+from pathlib import Path
 from typing import Optional
 from pydantic_settings import BaseSettings
 
@@ -39,7 +41,12 @@ class Settings(BaseSettings):
     secret_key: str = "your-secret-key-change-this-in-production"
     
     class Config:
-        env_file = ".env"
+        # 設定ファイルの優先順位: 1) 環境変数, 2) ~/.config/syui/ai/card/.env, 3) .env
+        config_dir = Path.home() / ".config" / "syui" / "ai" / "card"
+        env_file = [
+            str(config_dir / ".env"),  # ~/.config/syui/ai/card/.env
+            ".env"  # カレントディレクトリの.env
+        ]
         env_file_encoding = "utf-8"