feat(macOS): add gateway password auth support and fix Swift 6.2 concurrency

- Add CLAWDIS_GATEWAY_PASSWORD to launchd plist environment
- Read password from gateway.remote.password config in client
- Fix Swift 6.2 sending parameter violations in config save functions
- Add password parameter to GatewayConnection.Config type
- GatewayChannel now sends password in connect auth params
- GatewayEndpointStore and GatewayLaunchAgentManager read password from config
- CLI gateway client reads password from remote config and env

.gitignore

@@ -45,3 +45,4 @@ apps/ios/*.dSYM.zip
 
 # provisioning profiles (local)
 apps/ios/*.mobileprovision
+.env