fix(ci): Use >= instead of > for 80% threshold on macOS

The test was failing with exactly 40/50 (80.0%) success rate:
- EXPECT_GT(40, 40) fails (strict greater than)
- EXPECT_GE(40, 40) passes (greater than or equal)

macOS consistently achieves exactly 80% under concurrent load,
so the threshold should be inclusive (>=) rather than exclusive (>).

Author: libraz

tests/server/health_endpoint_test.cpp

@@ -282,7 +282,7 @@ TEST_F(HealthEndpointTest, ConcurrentHealthChecks) {
   // Most requests should succeed (allowing some failures due to timing)
 #ifdef __APPLE__
   // macOS network stack is more sensitive to concurrent connections, allow lower threshold
-  EXPECT_GT(success_count, num_requests * 0.8) << "At least 80% of concurrent requests should succeed on macOS";
+  EXPECT_GE(success_count, num_requests * 0.8) << "At least 80% of concurrent requests should succeed on macOS";
 #else
   EXPECT_GT(success_count, num_requests * 0.9) << "At least 90% of concurrent requests should succeed";
 #endif