feat: plugins v1

toju-app/src/app/domains/README.md

@@ -15,6 +15,7 @@ infrastructure adapters and UI.
 | **direct-message**   | One-to-one WebRTC messages, offline queueing, delivery state, and friends                                          | `DirectMessageService`, `FriendService`                     |
 | **game-activity**    | Local game detection, server metadata matching, P2P now-playing sync, and elapsed playtime formatting              | `GameActivityService`, `formatGameActivityElapsed()`        |
 | **notifications**    | Notification preferences, unread tracking, desktop alert orchestration                                             | `NotificationsFacade`                                       |
+| **plugins**          | Client-only plugin manifests, load ordering, registry state, and signal-server support metadata                    | `PluginHostService`, `PluginRegistryService`                |
 | **profile-avatar**   | Profile picture upload, crop/zoom editing, processing, local persistence, and P2P avatar sync                     | `ProfileAvatarFacade`                                       |
 | **screen-share**     | Source picker, quality presets                                                                                     | `ScreenShareFacade`                                         |
 | **server-directory** | Multi-server endpoint management, health checks, invites, server search UI                                         | `ServerDirectoryFacade`                                     |
@@ -32,6 +33,7 @@ The larger domains also keep longer design notes in their own folders:
 - [chat/README.md](chat/README.md)
 - [direct-message/README.md](direct-message/README.md)
 - [notifications/README.md](notifications/README.md)
+- [plugins/README.md](plugins/README.md)
 - [profile-avatar/README.md](profile-avatar/README.md)
 - [screen-share/README.md](screen-share/README.md)
 - [server-directory/README.md](server-directory/README.md)