Add system announcements interface

app/models/oauth/Client.model.js

@@ -24,10 +24,6 @@ class ClientModel extends Model {
         }
     }
 
-    can(scope) {
-        return this.api_scopes.includes()
-    }
-
     async application() {
         const Application = this.models.get('Application')
         return Application.findOne({ active: true, oauth_client_ids: this.id })

app/models/system/Announcement.model.js

@@ -0,0 +1,26 @@
+const { Model } = require('flitter-orm')
+
+class AnnouncementModel extends Model {
+    static get schema() {
+        return {
+            title: String,
+            message: String,
+            user_ids: [String],
+            group_ids: [String],
+            type: String, // login | email | banner
+        }
+    }
+
+    async to_api() {
+        return {
+            id: this.id,
+            title: this.title,
+            message: this.message,
+            user_ids: this.user_ids,
+            group_ids: this.group_ids,
+            type: this.type,
+        }
+    }
+}
+
+module.exports = exports = AnnouncementModel