feat: expose tag color in web API

lib/localiser/web/controllers/tag_controller.ex

@@ -136,6 +136,7 @@ defmodule Localiser.Web.Controllers.TagController do
       id:        tag.id,
       tag_id:    tag.tag_id,
       name:      tag.name,
+      color:     tag.color,
       room_id:   live && live.room_id,
       last_seen: live && live.last_seen
     }

lib/localiser/web/schemas.ex

@@ -70,10 +70,11 @@ defmodule Localiser.Web.Schemas do
         id:        %Schema{type: :integer},
         tag_id:    %Schema{type: :string},
         name:      %Schema{type: :string},
+        color:     %Schema{type: :string, nullable: true},
         room_id:   %Schema{type: :integer, nullable: true},
         last_seen: %Schema{type: :string, format: :"date-time", nullable: true}
       },
-      required: [:id, :tag_id, :name, :room_id, :last_seen]
+      required: [:id, :tag_id, :name, :color, :room_id, :last_seen]
     })
   end
 
@@ -325,7 +326,8 @@ defmodule Localiser.Web.Schemas do
       title: "TagParams", type: :object,
       properties: %{
         tag_id: %Schema{type: :string, description: "BLE MAC address or device ID"},
-        name:   %Schema{type: :string}
+        name:   %Schema{type: :string},
+        color:  %Schema{type: :string}
       },
       required: [:tag_id, :name]
     })
@@ -335,7 +337,10 @@ defmodule Localiser.Web.Schemas do
     require OpenApiSpex
     OpenApiSpex.schema(%{
       title: "TagUpdateParams", type: :object,
-      properties: %{name: %Schema{type: :string}}
+      properties: %{
+        name:  %Schema{type: :string},
+        color: %Schema{type: :string}
+      }
     })
   end
 end