feat: support multiple rate limits (#11260)

Added multi-limit support end-to-end by carrying limit_name in
rate-limit snapshots and handling multiple buckets instead of only
codex.
Extended /usage client parsing to consume additional_rate_limits
Updated TUI /status and in-memory state to store/render per-limit
snapshots
Extended app-server rate-limit read response: kept rate_limits and added
rate_limits_by_name.
Adjusted usage-limit error messaging for non-default codex limit buckets

codex-rs/app-server/src/outgoing_message.rs

@@ -283,6 +283,8 @@ mod tests {
         let notification =
             ServerNotification::AccountRateLimitsUpdated(AccountRateLimitsUpdatedNotification {
                 rate_limits: RateLimitSnapshot {
+                    limit_id: Some("codex".to_string()),
+                    limit_name: None,
                     primary: Some(RateLimitWindow {
                         used_percent: 25,
                         window_duration_mins: Some(15),
@@ -299,7 +301,9 @@ mod tests {
             json!({
                 "method": "account/rateLimits/updated",
                 "params": {
-                    "rateLimits": {
+                        "rateLimits": {
+                        "limitId": "codex",
+                        "limitName": null,
                         "primary": {
                             "usedPercent": 25,
                             "windowDurationMins": 15,