Expose plugin manifest keywords in app server (#21271)

## Summary
- Add plugin manifest keywords to core plugin marketplace/detail models
- Expose keywords on app-server v2 PluginSummary and generated
schema/types
- Populate keywords in plugin/list and plugin/read responses for local
plugins

Depends on https://github.com/openai/openai/pull/891087

## Validation
- just fmt
- just write-app-server-schema
- cargo test -p codex-app-server-protocol
- cargo test -p codex-core-plugins
- cargo test -p codex-app-server
plugin_list_keeps_valid_marketplaces_when_another_marketplace_fails_to_load
- cargo test -p codex-app-server
plugin_read_returns_plugin_details_with_bundle_contents

codex-rs/app-server/src/request_processors/plugins.rs

@@ -310,6 +310,7 @@ impl PluginRequestProcessor {
                                 auth_policy: plugin.policy.authentication.into(),
                                 availability: PluginAvailability::Available,
                                 interface: plugin.interface.map(local_plugin_interface_to_info),
+                                keywords: plugin.keywords,
                             })
                             .collect(),
                     })
@@ -465,6 +466,7 @@ impl PluginRequestProcessor {
                         auth_policy: outcome.plugin.policy.authentication.into(),
                         availability: PluginAvailability::Available,
                         interface: outcome.plugin.interface.map(local_plugin_interface_to_info),
+                        keywords: outcome.plugin.keywords,
                     },
                     description: outcome.plugin.description,
                     skills: plugin_skills_to_info(
@@ -1270,6 +1272,7 @@ fn remote_plugin_summary_to_info(summary: RemoteCatalogPluginSummary) -> PluginS
         auth_policy: summary.auth_policy,
         availability: summary.availability,
         interface: summary.interface,
+        keywords: summary.keywords,
     }
 }