Stop using AuthManager as the source of codex_home (#8846)

codex-rs/app-server/src/message_processor.rs

@@ -52,6 +52,7 @@ impl MessageProcessor {
             config.cli_auth_credentials_store_mode,
         );
         let thread_manager = Arc::new(ThreadManager::new(
+            config.codex_home.clone(),
             auth_manager.clone(),
             SessionSource::VSCode,
         ));