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/protocol/src/protocol.rs

@@ -1251,6 +1251,8 @@ pub struct TokenCountEvent {
 
 #[derive(Debug, Clone, PartialEq, Deserialize, Serialize, JsonSchema, TS)]
 pub struct RateLimitSnapshot {
+    pub limit_id: Option<String>,
+    pub limit_name: Option<String>,
     pub primary: Option<RateLimitWindow>,
     pub secondary: Option<RateLimitWindow>,
     pub credits: Option<CreditsSnapshot>,