添加Ai 能力，重构项目结构

app/config/__init__.py

@@ -0,0 +1,18 @@
+import os
+from pathlib import Path
+
+from .settings import Settings
+
+_env = os.getenv("ENV", "dev")
+_env_files = {"dev": ".env", "test": ".env.test", "prod": ".env.prod"}
+
+# 定位项目根目录（config 上两级）
+_project_root = Path(__file__).resolve().parent.parent.parent
+_env_file = _project_root / _env_files.get(_env, ".env")
+
+if not _env_file.exists():
+    raise FileNotFoundError(f".env 文件不存在: {_env_file}")
+
+settings = Settings(_env_file=str(_env_file))
+
+__all__ = ["settings"]

app/config/settings.py

@@ -0,0 +1,22 @@
+from pydantic_settings import BaseSettings, SettingsConfigDict
+
+
+class Settings(BaseSettings):
+    """项目配置，通过环境变量或项目根目录下的 .env 文件覆盖。"""
+
+    env: str = "dev"
+
+    # 火山引擎（OpenAI 兼容风格）
+    volcengine_api_key: str = ""
+    volcengine_base_url: str = "https://ark.cn-beijing.volces.com/api/v3"
+
+    # Claude（Anthropic 风格）
+    anthropic_api_key: str = ""
+    anthropic_base_url: str = ""
+
+    model_config = SettingsConfigDict(
+        env_file=".env",
+        env_file_encoding="utf-8",
+        case_sensitive=False,
+        extra="ignore",
+    )