fix(openai): install ring crypto provider before rustls use

rustls 0.23 compiles both ring and aws-lc-rs in this workspace (aws-sdk-s3
pulls aws-lc-rs), so the process-level CryptoProvider cannot be auto-selected
and any TLS use panics inside spawned tasks - which made the websocket idle
timeout test hang forever. Install the pinned ring provider once before the
first TLS use, with a startup call in the gateway binary as a fallback.

Co-authored-by: Codex <noreply@openai.com>

backend/apps/gateway/src/main.rs

@@ -1,6 +1,9 @@
 use std::{env, error::Error, io};
 
+use provider_openai::transport::tls::ensure_rustls_provider;
+
 fn main() -> Result<(), Box<dyn Error + Send + Sync>> {
+    ensure_rustls_provider();
     let mut arguments = env::args_os().skip(1);
     match arguments.next().as_deref().and_then(|value| value.to_str()) {
         None | Some("serve") => {

backend/crates/providers/openai/src/transport/tls.rs

@@ -1,4 +1,8 @@
-use std::{env, fs, io, path::PathBuf, sync::Arc};
+use std::{
+    env, fs, io,
+    path::PathBuf,
+    sync::{Arc, OnceLock},
+};
 
 use rustls::{ClientConfig, RootCertStore};
 use rustls_pki_types::{
@@ -11,6 +15,16 @@ const CA_CERT_HINT: &str = "If you set CODEX_CA_CERTIFICATE or SSL_CERT_FILE, en
 
 type PemSection = (SectionKind, Vec<u8>);
 
+/// rustls 0.23 在同时编译 `ring` 与 `aws-lc-rs` 时无法自动选择进程级
+/// CryptoProvider；本工程固定使用 ring（与官方 Codex Desktop JA3 一致），
+/// 因此在首次 TLS 使用前显式安装一次。重复安装会被 rustls 忽略。
+pub fn ensure_rustls_provider() {
+    static INSTALL: OnceLock<()> = OnceLock::new();
+    INSTALL.get_or_init(|| {
+        let _ = rustls::crypto::ring::default_provider().install_default();
+    });
+}
+
 /// 自定义 CA 证书环境变量名。
 pub const CODEX_CA_CERT_ENV: &str = "CODEX_CA_CERTIFICATE";
 /// 系统 CA 文件环境变量名。
@@ -111,6 +125,7 @@ fn build_reqwest_client_with_env(
     env_source: &dyn EnvSource,
     mut builder: reqwest::ClientBuilder,
 ) -> CustomCaResult<reqwest::Client> {
+    ensure_rustls_provider();
     let Some(bundle) = env_source.configured_ca_bundle() else {
         return builder
             .build()
@@ -142,6 +157,7 @@ fn build_reqwest_client_with_env(
 fn maybe_build_rustls_client_config_with_env(
     env_source: &dyn EnvSource,
 ) -> CustomCaResult<Option<Arc<ClientConfig>>> {
+    ensure_rustls_provider();
     let Some(bundle) = env_source.configured_ca_bundle() else {
         return Ok(None);
     };