Restore embed placeholder and reflow architecture notes

make build overwrote the tracked internal/frontend/dist/index.html
placeholder in the previous commit; put it back as it is on dev.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/frontend/dist/index.html

@@ -2,14 +2,10 @@
 <html lang="en">
   <head>
     <meta charset="UTF-8" />
-    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-    <meta name="theme-color" content="#5a358c" />
-    <link rel="apple-touch-icon" href="/apple-touch-icon.png" />
     <title>MealQuest</title>
-    <script type="module" crossorigin src="/assets/index-CtlEgrTB.js"></script>
-    <link rel="stylesheet" crossorigin href="/assets/index-CbjluR9l.css">
-  <link rel="manifest" href="/manifest.webmanifest"><script id="vite-plugin-pwa:register-sw" src="/registerSW.js"></script></head>
+  </head>
   <body>
-    <div id="root"></div>
+    <!-- Placeholder so the Go embed compiles. The build replaces this directory with web/dist. -->
+    <p>MealQuest web assets have not been built.</p>
   </body>
 </html>