[apps] Add is_enabled to app info. (#11417)

- [x] Add is_enabled to app info and the response of `app/list`.
- [x] Update TUI to have Enable/Disable button on the app detail page.

codex-rs/tui/src/app_event.rs

@@ -107,11 +107,13 @@ pub(crate) enum AppEvent {
 
     /// Open the app link view in the bottom pane.
     OpenAppLink {
+        app_id: String,
         title: String,
         description: Option<String>,
         instructions: String,
         url: String,
         is_installed: bool,
+        is_enabled: bool,
     },
 
     /// Open the provided URL in the user's browser.
@@ -297,6 +299,12 @@ pub(crate) enum AppEvent {
         enabled: bool,
     },
 
+    /// Enable or disable an app by connector ID.
+    SetAppEnabled {
+        id: String,
+        enabled: bool,
+    },
+
     /// Notify that the manage skills popup was closed.
     ManageSkillsClosed,