首次提交

backend/config.py

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+from pydantic_settings import BaseSettings
+from functools import lru_cache
+from pathlib import Path
+
+# 项目根目录（backend/ 的上级目录）
+PROJECT_ROOT = Path(__file__).parent.parent
+ENV_FILE = PROJECT_ROOT / ".env"
+
+
+class Settings(BaseSettings):
+    database_url: str = "sqlite+aiosqlite:///./certcenter.db"
+    secret_key: str = "change-me-to-a-random-string"
+    admin_username: str = "admin"
+    admin_password: str = "admin123"
+    cert_dir: str = "/srv/certs"
+    base_url: str = "https://cert.example.com"
+
+    class Config:
+        env_file = str(ENV_FILE)
+        env_file_encoding = "utf-8"
+
+
+@lru_cache
+def get_settings() -> Settings:
+    return Settings()