fix: prevent CLI hang when --registry-url points to unreachable host (#2027)

Add AbortController with 5-second timeout to the fetch call in
registryValidation() so the CLI no longer hangs indefinitely. Switch
from GET to HEAD for a lighter validation request, and surface distinct
error messages for timeout vs general network failures.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: Pyiner

src/utils/generate/registry.ts

@@ -8,12 +8,26 @@ export function registryURLParser(input?: string) {
 
 export async function registryValidation(registryUrl?: string, registryAuth?: string, registryToken?: string) {
   if (!registryUrl) { return; }
+  const TIMEOUT_MS = 5000;
+  const controller = new AbortController();
+  const timeoutId = setTimeout(() => controller.abort(), TIMEOUT_MS);
   try {
-    const response = await fetch(registryUrl as string);
+    const response = await fetch(registryUrl as string, {
+      method: 'HEAD',
+      signal: controller.signal,
+    });
     if (response.status === 401 && !registryAuth && !registryToken) {
       throw new Error('You Need to pass either registryAuth in username:password encoded in Base64 or need to pass registryToken');
     }
-  } catch {
-    throw new Error(`Can't fetch registryURL: ${registryUrl}`);
+  } catch (error: unknown) {
+    if (error instanceof Error && error.name === 'AbortError') {
+      throw new Error(`Registry URL validation timed out after ${TIMEOUT_MS / 1000}s — the host at ${registryUrl} appears unreachable.`);
+    }
+    if (error instanceof Error && error.message.startsWith('You Need to pass')) {
+      throw error;
+    }
+    throw new Error(`Unable to reach registry at ${registryUrl}. Ensure the URL is correct and the host is reachable.`);
+  } finally {
+    clearTimeout(timeoutId);
   }
 }