Fix HTML serving: use Bun.file() instead of HTMLBundle import

Fixes [object HTMLBundle] error by properly reading HTML file

Co-Authored-By: Claude Sonnet 4.5 (1M context) <noreply@anthropic.com>

server.ts

@@ -1,5 +1,3 @@
-import index from './public/index.html'
-
 const PORT = process.env.PORT || 3001
 const BACKEND_URL = process.env.BACKEND_URL || 'http://localhost:3000'
 
@@ -43,26 +41,18 @@ Bun.serve({
     }
 
     // Serve static files from public directory
-    if (url.pathname !== '/' && !url.pathname.includes('.')) {
-      // SPA routing - serve index.html for all non-file routes
-      return new Response(index, {
-        headers: {
-          'Content-Type': 'text/html',
-        },
-      })
+    const staticFile = Bun.file(`./public${url.pathname}`)
+    if (await staticFile.exists()) {
+      return new Response(staticFile)
     }
 
-    // Serve index.html for root
-    if (url.pathname === '/') {
-      return new Response(index, {
-        headers: {
-          'Content-Type': 'text/html',
-        },
-      })
-    }
-
-    // Let Bun handle other static files
-    return new Response('Not Found', { status: 404 })
+    // For all other routes (SPA routing), serve index.html
+    const indexFile = Bun.file('./public/index.html')
+    return new Response(indexFile, {
+      headers: {
+        'Content-Type': 'text/html',
+      },
+    })
   },
   development: {
     hmr: true,