chore: Halkyon Todo's scaffold joins the repository in apps/todo

Its server, client and app as `serverpod create` made them, with the
switch to server-side sessions that was waiting uncommitted, as files:
its one commit holds the scaffold alone.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Tizian 「ティツィアーン」 <raisondetredev@pm.me>

apps/todo/halkyon_todo_server/web/templates/built_with_serverpod.html

@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8">
+    <title>Built with Serverpod</title>
+    <link rel="stylesheet" href="{{{@/web/css/style.css}}}">
+  </head>
+  <body>
+    <div class="content">
+      <div class="logo-box">
+        <img src="{{{@/web/images/serverpod-logo.svg}}}" width="160" style="margin-top: 8px; margin-bottom: 12px;">
+        <p><a href="https://serverpod.dev/">The missing server for Flutter</a></p>
+      </div>
+      <hr>
+      <div class="info-box">
+        <p>Served at: {{served}}</p>
+        <p>Run mode: {{runmode}}</p>
+      </div>
+      <div style="text-align: center; margin: 20px 0;">
+        <a class="cta" href="/app">
+            Open Flutter app 
+          </a>
+      </div>
+      <hr>
+      <div class="link-box">
+        <a href="https://serverpod.dev">Serverpod</a>
+        •
+        <a href="https://docs.serverpod.dev">Get Started</a>
+        •
+        <a href="https://github.com/serverpod/serverpod">Github</a>
+      </div>
+    </div>
+  </body>
+</html>