refactor: simplify config value formatting in CodexProvider

- Removed unnecessary JSON.stringify conversion for string values in formatConfigValue function, streamlining the value formatting process.
- This change enhances code clarity and reduces complexity in the configuration handling of the CodexProvider.

apps/server/src/providers/codex-provider.ts

@@ -311,9 +311,6 @@ function buildCombinedPrompt(options: ExecuteOptions, systemPromptText?: string
 }
 
 function formatConfigValue(value: string | number | boolean): string {
-  if (typeof value === 'string') {
-    return JSON.stringify(value);
-  }
   return String(value);
 }