🔨 docs(lib/backend/schemas): Add @moduledoc for ecto schemas

Author: worthant

lib/backend/schemas/file.ex

@@ -1,4 +1,8 @@
 defmodule Backend.File do
+  @moduledoc """
+  PostgreSQL schema: `File`
+  > Managed by *Ecto ORM*
+  """
   use Ecto.Schema
 
   schema "files" do

lib/backend/schemas/user.ex

@@ -1,4 +1,8 @@
 defmodule Backend.User do
+  @moduledoc """
+  PostgreSQL schema: `User`
+  > Managed by *Ecto ORM*
+  """
   use Ecto.Schema
 
   schema "users" do