Support Enterprise automation account plans (#36228)

## What changed

- Recognize `enterprise_cbp_automation` as an Enterprise workspace plan in authentication, backend responses, and app-server account and rate-limit APIs.
- Expose the plan in generated protocol schemas and display it as `Enterprise (Automation)` in account status.
- Apply existing workspace eligibility and Business usage-limit behavior to the new plan.

## Testing

- Cover JWT parsing, plan conversion and serialization, app-server responses, workspace eligibility, usage-limit formatting, and TUI status rendering.

GitOrigin-RevId: d84ae2be3dd60fe398f226e6dc434efe27a387a5

codex-rs/protocol/src/error_tests.rs

@@ -336,7 +336,11 @@ fn usage_limit_reached_error_formats_team_plan() {
 
 #[test]
 fn usage_limit_reached_error_formats_business_plan_without_reset() {
-    for plan in [KnownPlan::Business, KnownPlan::Ent26] {
+    for plan in [
+        KnownPlan::Business,
+        KnownPlan::Ent26,
+        KnownPlan::EnterpriseCbpAutomation,
+    ] {
         let err = UsageLimitReachedError {
             plan_type: Some(PlanType::Known(plan)),
             resets_at: None,