fix(core): fix secrets scan upserts, connection health checks, and frontend improvements

- Add upsert pattern to SecretsScanService to prevent duplicate key errors on repeated scans
- Auto-test connection health on startup so status reflects reality
- Fix Actions view to read identity from appstate instead of broken localStorage hack
- Fetch both project and group secrets in parallel, add "All Scopes" filter to Secrets view
- Enable noCache on UtilityWebsiteServer to prevent stale browser cache

test/test.storage_test.ts

@@ -136,4 +136,8 @@ Deno.test('ConnectionManager with StorageManager: create and load', async () =>
   const conns = cm2.getConnections();
   assertEquals(conns.length, 1);
   assertEquals(conns[0].id, conn.id);
+
+  // Wait for background health checks to avoid resource leaks
+  await cm.healthCheckDone;
+  await cm2.healthCheckDone;
 });