init code

app/config.py

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+"""
+app/config.py - 应用配置管理
+"""
+
+from pydantic_settings import BaseSettings
+from functools import lru_cache
+
+
+class Settings(BaseSettings):
+    """应用配置"""
+
+    # API 配置
+    api_key: str
+    model: str = "gemini-3.1-flash"
+    base_url: str = "https://generativelanguage.googleapis.com/v1beta/openai/"
+
+    # FastAPI 配置
+    fastapi_host: str = "0.0.0.0"
+    fastapi_port: int = 8000
+    fastapi_debug: bool = True
+
+    # LangGraph 配置
+    langgraph_debug: bool = False
+
+    # 项目信息
+    project_name: str = "AI Agent Project"
+    project_version: str = "0.1.0"
+
+    class Config:
+        env_file = ".env"
+        case_sensitive = False
+
+
+@lru_cache()
+def get_settings() -> Settings:
+    """获取应用配置的单例"""
+    return Settings()
+