Add phx.gen.auth authentication scaffolding

- LiveView-based email/password auth via mix phx.gen.auth
- Auth links removed from public navigation (direct URL access only)
- Accounts context with User schema and token management

app/lib/firehose_web/components/layouts.ex

@@ -9,6 +9,7 @@ defmodule FirehoseWeb.Layouts do
   # The default root.html.heex file contains the HTML
   # skeleton of your application, namely HTML headers
   # and other static content.
+
   embed_templates "layouts/*"
 
   @doc """