Add settings for frontend instance URL

Model/Accounts/AccountsBridge.swift

@@ -0,0 +1,37 @@
+import Defaults
+import Foundation
+
+struct AccountsBridge: Defaults.Bridge {
+    typealias Value = Account
+    typealias Serializable = [String: String]
+
+    func serialize(_ value: Value?) -> Serializable? {
+        guard let value = value else {
+            return nil
+        }
+
+        return [
+            "id": value.id,
+            "instanceID": value.instanceID,
+            "name": value.name ?? "",
+            "apiURL": value.url,
+            "sid": value.sid
+        ]
+    }
+
+    func deserialize(_ object: Serializable?) -> Value? {
+        guard
+            let object = object,
+            let id = object["id"],
+            let instanceID = object["instanceID"],
+            let url = object["apiURL"],
+            let sid = object["sid"]
+        else {
+            return nil
+        }
+
+        let name = object["name"] ?? ""
+
+        return Account(id: id, instanceID: instanceID, name: name, url: url, sid: sid)
+    }
+}