Fix Sentry probe lint

Author: strongkeep-debug

src/api/app.py

@@ -194,7 +194,7 @@ async def prometheus_metrics():
     async def sentry_debug():
         """Intentionally raises an error to verify Sentry is capturing exceptions."""
         try:
-            division_by_zero = 1 / 0
+            1 / 0
         except ZeroDivisionError as exc:
             from src.config.monitoring import capture_exception
             capture_exception(exc)