Add custom headers to direct connections (#2922)

* Add custom headers to direct connections

* Address custom header review feedback

* Fix direct connection header integration

* Fix desktop relay E2E transport setup

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Co-authored-by: Claude <claude@Claudes-Mac-mini.local>
Co-authored-by: Mohamed Boudra <boudra.moha@gmail.com>

packages/client/src/index.ts

@@ -57,6 +57,7 @@ export interface PaseoClientConfig {
   runtimeGeneration?: number | null;
   password?: string;
   authHeader?: string;
+  headers?: Record<string, string>;
   suppressSendErrors?: boolean;
   logger?: PaseoLogger;
   connectTimeoutMs?: number;