feat: add database configuration and health check

backend/hermes/app/core/config.py

@@ -0,0 +1,16 @@
+from pydantic_settings import BaseSettings, SettingsConfigDict
+
+
+class Settings(BaseSettings):
+    app_name: str = "Hermes API"
+    app_version: str = "0.1.0"
+
+    database_url: str
+
+    model_config = SettingsConfigDict(
+        env_file=".env",
+        case_sensitive=False
+    )
+
+
+settings = Settings()