Initial commit

backend/app/core/__init__.py

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backend/app/core/config.py

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+from functools import lru_cache
+
+from pydantic import Field
+from pydantic_settings import BaseSettings, SettingsConfigDict
+from sqlalchemy.engine import URL
+
+
+class Settings(BaseSettings):
+    app_name: str = Field(default="Jiaheng Hardware ERP API", alias="APP_NAME")
+    app_env: str = Field(default="dev", alias="APP_ENV")
+    app_host: str = Field(default="0.0.0.0", alias="APP_HOST")
+    app_port: int = Field(default=8000, alias="APP_PORT")
+    api_prefix: str = "/api"
+    mysql_host: str = Field(default="127.0.0.1", alias="MYSQL_HOST")
+    mysql_port: int = Field(default=3306, alias="MYSQL_PORT")
+    mysql_database: str = Field(default="jiaheng_erp", alias="MYSQL_DATABASE")
+    mysql_user: str = Field(default="root", alias="MYSQL_USER")
+    mysql_password: str = Field(default="replace_me", alias="MYSQL_PASSWORD")
+    allowed_origins: str = Field(default="http://localhost:5173", alias="ALLOWED_ORIGINS")
+    auth_secret_key: str = Field(default="jiaheng-erp-dev-secret-change-me", alias="AUTH_SECRET_KEY")
+    auth_token_expire_minutes: int = Field(default=480, alias="AUTH_TOKEN_EXPIRE_MINUTES")
+
+    model_config = SettingsConfigDict(env_file=".env", env_file_encoding="utf-8", extra="ignore")
+
+    @property
+    def mysql_dsn(self) -> URL:
+        return URL.create(
+            "mysql+pymysql",
+            username=self.mysql_user,
+            password=self.mysql_password,
+            host=self.mysql_host,
+            port=self.mysql_port,
+            database=self.mysql_database,
+        )
+
+    @property
+    def cors_origins(self) -> list[str]:
+        return [origin.strip() for origin in self.allowed_origins.split(",") if origin.strip()]
+
+
+@lru_cache
+def get_settings() -> Settings:
+    return Settings()