refactor flows into canonical runtime architecture

docs/多注册流程架构边界.md

@@ -77,8 +77,8 @@ flows/
 - `phone-sms/providers/hero-sms.js`
 - `phone-sms/providers/five-sim.js`
 - `phone-sms/providers/registry.js`
-- `content/phone-auth.js`
-- `content/phone-country-utils.js`
+- `flows/openai/content/phone-auth.js`
+- `flows/openai/content/phone-country-utils.js`
 - sidepanel 中的接码配置区
 - 相关测试：`tests/phone-verification-flow.test.js`、`tests/five-sim-provider.test.js`、`tests/sidepanel-phone-verification-settings.test.js`