Fix: Remove duplicate /assets/ prefix from manifest paths

- Manifest already includes 'assets/' prefix
- Fixes double /assets/assets/ paths in production
- Ensures correct asset loading

src/server/routes/client-entry.tsx

@@ -16,9 +16,9 @@ export function clientEntry(c: Context<BlankEnv>) {
       const manifest = JSON.parse(readFileSync(manifestPath, 'utf-8'));
       const entry = manifest['index.html'];
       if (entry) {
-        jsFile = `/assets/${entry.file}`;
+        jsFile = `/${entry.file}`;
         if (entry.css) {
-          cssFiles = entry.css.map((css: string) => `/assets/${css}`);
+          cssFiles = entry.css.map((css: string) => `/${css}`);
         }
       }
     } catch (error) {