修复 Codex 切换供应商后历史记录变化 (#2349)

* Keep Codex history stable across provider switches

* Restore template Codex provider id when backfilling live config

Backfill writes the current Codex live config back to the previous
provider's stored template after a switch. Because the live file now
carries a normalized stable model_provider id, the previous provider's
template would lose its own provider-specific id (and any matching
[profiles.*] references) on every subsequent switch.

Reverse the normalization at backfill time by rewriting model_provider,
the active model_providers section, and matching profile references back
to the template's original id.

---------

Co-authored-by: Jason <farion1231@gmail.com>

src-tauri/src/services/config.rs

@@ -156,7 +156,7 @@ impl ConfigService {
         }
         let cfg_text = settings.get("config").and_then(Value::as_str);
 
-        crate::codex_config::write_codex_live_atomic(auth, cfg_text)?;
+        crate::codex_config::write_codex_live_atomic_with_stable_provider(auth, cfg_text)?;
         // 注意：MCP 同步在 v3.7.0 中已通过 McpService 进行，不再在此调用
         // sync_enabled_to_codex 使用旧的 config.mcp.codex 结构，在新架构中为空
         // MCP 的启用/禁用应通过 McpService::toggle_app 进行