Merge task branch for: Worker: UsageGate — Queue ab Schwelle pausieren

src/ClaudeDo.Worker/Program.cs

@@ -206,6 +206,7 @@ builder.Services.AddHttpClient<IUsageClient, ClaudeOAuthUsageClient>(client =>
     client.Timeout = TimeSpan.FromSeconds(5);
 });
 builder.Services.AddHostedService<UsageMonitorService>();
+builder.Services.AddSingleton<IUsageGate, UsageGate>();
 
 // Loopback-only bind. Firewall is irrelevant for 127.0.0.1.
 builder.WebHost.UseUrls($"http://127.0.0.1:{cfg.SignalRPort}");