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

src/gateway/call.ts

@@ -46,7 +46,7 @@ export async function callGateway<T = unknown>(
     (typeof opts.password === "string" && opts.password.trim().length > 0
       ? opts.password.trim()
       : undefined) ||
-    process.env.CLAWDIS_GATEWAY_PASSWORD ||
+    (process.env.CLAWDIS_GATEWAY_PASSWORD?.trim()) ||
     (typeof remote?.password === "string" && remote.password.trim().length > 0
       ? remote.password.trim()
       : undefined);