feat(FN-094): add comment line for deployment verification

- Added a comment line to main.ts for deployment verification purposes

apps/api/src/main.ts

@@ -1,3 +1,4 @@
+// hello-from-fusion
 import "./instrument"; // MUST be first — initializes Sentry before any other imports
 import "./telemetry/tracing"; // MUST be early — instruments modules before they load