Stage 04.3 - repositories, balance snapshots and environment mode fix

app/src/core/config.py

@@ -26,6 +26,8 @@ class Settings:
     db_name: str
     db_user: str
     db_password: str
+def is_demo_mode(self) -> bool:
+    return "demo" in self.exchange_base_url.lower()
 def _parse_bool(raw_value: str, default: bool = False) -> bool:
     value = (raw_value or "").strip().lower()
     if not value: