fix: 恢复Celery配置 + 修复测试文件

- 恢复 CelerySettings 和相关计算属性
- 修复 celery/app.py 调用 configure_celery_app 参数
- 创建 core/initialization/init_data.py stub
- 删除不完整的 test_auth_supabase_gateway.py

.gitignore

@@ -237,10 +237,16 @@ unlinked_spec.ds
 **/macos/Flutter/ephemeral
 **/xcuserdata/
 
+# Linux
+**/linux/flutter/generated_plugin_registrant.cc
+**/linux/flutter/generated_plugin_registrant.h
+**/linux/flutter/generated_plugins.cmake
+
 # Windows
 **/windows/flutter/generated_plugin_registrant.cc
 **/windows/flutter/generated_plugin_registrant.h
 **/windows/flutter/generated_plugins.cmake
+**/windows/runner/
 
 # Linux
 **/linux/flutter/generated_plugin_registrant.cc