fix(cli): improve serve error handling output

Keep serve UX consistent when docs directory is missing or server fails.

Signed-off-by: night-slayer18 <samanuaia257@gmail.com>

Author: night-slayer18

packages/cli/src/commands/serve.ts

@@ -38,7 +38,7 @@ export function registerServe(program: Command): void {
         app.use(express.default.static(docsDir));
 
         // SPA fallback - serve index.html for all routes (for React Router)
-        app.get('*', (_req: import('express').Request, res: import('express').Response) => {
+        app.get(/(.*)/, (_req: import('express').Request, res: import('express').Response) => {
           res.sendFile(path.join(docsDir, 'index.html'), (err: unknown) => {
             if (err) {
               res.status(404).send('Documentation not found. Run: autodocs build');