fix: 将 README 中 Codex WS 配置迁移至使用密钥弹窗

- 移除 README.md / README_CN.md 中的 Codex CLI WebSocket v2 配置示例
- UseKeyModal OpenAI 分组新增 "Codex CLI (WebSocket)" tab，区分普通模式与 WS 模式
- 普通模式 config.toml 不含 WebSocket 字段，WS 模式包含 supports_websockets 和 features 配置
- 所有配置统一使用 sub2api 作为 model_provider 名称

README.md

@@ -57,34 +57,6 @@ Sub2API is an AI API gateway platform designed to distribute and manage API quot
 
 ---
 
-## Codex CLI WebSocket v2 Example
-
-To enable OpenAI WebSocket Mode v2 in Codex CLI with Sub2API, add the following to `~/.codex/config.toml`:
-
-```toml
-model_provider = "aicodx2api"
-model = "gpt-5.3-codex"
-review_model = "gpt-5.3-codex"
-model_reasoning_effort = "xhigh"
-disable_response_storage = true
-network_access = "enabled"
-windows_wsl_setup_acknowledged = true
-
-[model_providers.aicodx2api]
-name = "aicodx2api"
-base_url = "https://api.sub2api.ai"
-wire_api = "responses"
-supports_websockets = true
-requires_openai_auth = true
-
-[features]
-responses_websockets_v2 = true
-```
-
-After updating the config, restart Codex CLI.
-
----
-
 ## Deployment
 
 ### Method 1: Script Installation (Recommended)