feat(auth): add secure configuration and environment support

backend/hermes/app/core/config.py

@@ -2,15 +2,16 @@ from pydantic_settings import BaseSettings, SettingsConfigDict
 
 
 class Settings(BaseSettings):
+    database_url: str
+    secret_key: str
+
     app_name: str = "Hermes API"
     app_version: str = "0.1.0"
 
-    database_url: str
-
     model_config = SettingsConfigDict(
         env_file=".env",
-        case_sensitive=False
+        extra="ignore",
     )
 
 
-settings = Settings()
+settings = Settings()