fix(mac): restore gateway clear log

apps/macos/Sources/Clawdis/GatewayProcessManager.swift

@@ -227,4 +227,8 @@ final class GatewayProcessManager: ObservableObject {
     func projectRootPath() -> String {
         CommandResolver.projectRootPath()
     }
+
+    func clearLog() {
+        self.log = ""
+    }
 }