Fix: specific API keys are now optional to prevent startup crash when env vars are missing

src/infra/config.py

@@ -43,8 +43,8 @@ class Settings(BaseSettings):
     )
 
     # Google Maps (Required for Scout and Traffic agents)
-    google_maps_api_key: str = Field(
-        ...,
+    google_maps_api_key: Optional[str] = Field(
+        None,
         alias="GOOGLE_MAPS_API_KEY",
         description="Google Maps Platform API key"
     )