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-protocol/schema/json/v1/ResumeConversationResponse.json

@@ -3470,6 +3470,18 @@
             }
           ]
         },
+        "limit_id": {
+          "type": [
+            "string",
+            "null"
+          ]
+        },
+        "limit_name": {
+          "type": [
+            "string",
+            "null"
+          ]
+        },
         "plan_type": {
           "anyOf": [
             {