Support self-serve Business ProLite accounts (#35785)

## What changed

- Recognize `self_serve_business_prolite` across authentication, account and rate-limit APIs, generated schemas, workspace classification, status display, cloud configuration gating, and usage-limit messaging.
- Keep the Python SDK's `PlanType` enum compatible with non-empty string values introduced by newer Codex runtimes while preserving its known constants.

## Testing

- Cover token parsing, account reads and notifications, backend rate-limit mapping, workspace behavior, error formatting, and Python SDK response coercion for the new plan value.

GitOrigin-RevId: 70bc17a7c4ba4028cb10e4333cc1f2ac64da361f

codex-rs/login/src/token_data_tests.rs

@@ -122,6 +122,27 @@ fn id_token_info_parses_usage_based_business_plans() {
     assert_eq!(enterprise_cbp.is_workspace_account(), true);
 }
 
+#[test]
+fn id_token_info_parses_self_serve_business_prolite_plan() {
+    let jwt = fake_jwt(serde_json::json!({
+        "email": "user@example.com",
+        "https://api.openai.com/auth": {
+            "chatgpt_plan_type": "self_serve_business_prolite"
+        }
+    }));
+
+    let info = parse_chatgpt_jwt_claims(&jwt).expect("should parse");
+    assert_eq!(
+        info.get_chatgpt_plan_type().as_deref(),
+        Some("Self Serve Business ProLite")
+    );
+    assert_eq!(
+        info.get_chatgpt_plan_type_raw().as_deref(),
+        Some("self_serve_business_prolite")
+    );
+    assert_eq!(info.is_workspace_account(), true);
+}
+
 #[test]
 fn id_token_info_handles_missing_fields() {
     let fake_jwt = fake_jwt(serde_json::json!({ "sub": "123" }));