Wire up cloud reqs in exec, app-server (#10241)

We're fetching cloud requirements in TUI in
https://github.com/openai/codex/pull/10167.

This adds the same fetching in exec and app-server binaries also.

codex-rs/exec-server/src/posix.rs

@@ -241,7 +241,7 @@ async fn load_exec_policy() -> anyhow::Result<Policy> {
         cwd,
         &cli_overrides,
         overrides,
-        None,
+        codex_core::config_loader::CloudRequirementsLoader::default(),
     )
     .await?;