Add API endpoints for a custom user mascot

lib/pleroma/user/info.ex

@@ -43,6 +43,19 @@ defmodule Pleroma.User.Info do
     field(:hide_favorites, :boolean, default: true)
     field(:pinned_activities, {:array, :string}, default: [])
     field(:flavour, :string, default: nil)
+
+    field(:mascot, :map,
+      default: %{
+        id: "pleromatan",
+        url: "/images/pleroma-fox-tan-smol.png",
+        type: "image",
+        preview_url: "/images/pleroma-fox-tan-smol.png",
+        pleroma: %{
+          mime_type: "image/png"
+        }
+      }
+    )
+
     field(:emoji, {:array, :map}, default: [])
 
     field(:notification_settings, :map,
@@ -248,6 +261,14 @@ defmodule Pleroma.User.Info do
     |> validate_required([:flavour])
   end
 
+  def mascot_update(info, url) do
+    params = %{mascot: url}
+
+    info
+    |> cast(params, [:mascot])
+    |> validate_required([:mascot])
+  end
+
   def set_source_data(info, source_data) do
     params = %{source_data: source_data}