[codex][mcp] Add resource uri meta to tool call item. (#17831)

- [x] Add resource uri meta to tool call item so that the app-server
client can start prefetching resources immediately without loading mcp
server status.

codex-rs/app-server-protocol/schema/json/v2/ThreadReadResponse.json

@@ -1206,6 +1206,12 @@
             "id": {
               "type": "string"
             },
+            "mcpAppResourceUri": {
+              "type": [
+                "string",
+                "null"
+              ]
+            },
             "result": {
               "anyOf": [
                 {