[codex] Add created-by-me remote plugin marketplace (#28203)

## Summary
- add the `created-by-me-remote` marketplace backed by paginated
`scope=USER` plugin directory and installed-plugin requests
- include USER plugins in installed-plugin caching, bundle sync, and
stale-cache cleanup without client-side discoverability filtering
- expose the marketplace through app-server v2 and regenerate the
protocol schemas

## Testing
- `cargo build -p codex-app-server --bin codex-app-server`
- production-auth `plugin/list` smoke test for `created-by-me-remote`
(returned the expected USER plugin as installed and enabled)
- `just test -p codex-core-plugins` (221 passed)
- `just test -p codex-app-server-protocol` (231 passed)
- `just test -p codex-app-server suite::v2::plugin_list::` (37 passed)
- `just fix -p codex-core-plugins -p codex-app-server-protocol -p
codex-app-server`
- `just fmt`

codex-rs/app-server-protocol/src/protocol/v2/plugin.rs

@@ -165,6 +165,9 @@ pub enum PluginListMarketplaceKind {
     #[serde(rename = "shared-with-me")]
     #[ts(rename = "shared-with-me")]
     SharedWithMe,
+    #[serde(rename = "created-by-me-remote")]
+    #[ts(rename = "created-by-me-remote")]
+    CreatedByMeRemote,
 }
 
 #[derive(Serialize, Deserialize, Debug, Clone, PartialEq, JsonSchema, TS)]

codex-rs/app-server-protocol/src/protocol/v2/tests.rs

@@ -2907,6 +2907,7 @@ fn plugin_list_params_serializes_marketplace_kind_filter() {
                 PluginListMarketplaceKind::Vertical,
                 PluginListMarketplaceKind::WorkspaceDirectory,
                 PluginListMarketplaceKind::SharedWithMe,
+                PluginListMarketplaceKind::CreatedByMeRemote,
             ]),
         })
         .unwrap(),
@@ -2917,6 +2918,7 @@ fn plugin_list_params_serializes_marketplace_kind_filter() {
                 "vertical",
                 "workspace-directory",
                 "shared-with-me",
+                "created-by-me-remote",
             ],
         }),
     );