fix: add timeout and HEAD method to registry URL validation

[Pyiner]

Summary

Fixes #2027 — CLI hangs indefinitely when --registry-url points to an unreachable host.

Changes:

• Added AbortController with 5-second timeout to registryValidation() in src/utils/generate/registry.ts
• Switched from GET to HEAD for lightweight validation (no response body needed)
• Improved error messages — distinct messages for timeout vs network failure
• Added cleanup — clearTimeout in finally block prevents timer leaks

Before:

asyncapi generate fromTemplate spec.yaml @asyncapi/html-template \
  --registry-url http://10.255.255.1
# CLI hangs indefinitely ❌

After:

asyncapi generate fromTemplate spec.yaml @asyncapi/html-template \
  --registry-url http://10.255.255.1
# Error: Registry URL validation timed out after 5s — the host at http://10.255.255.1 appears unreachable. ✅

Testing:

• All 46 existing unit tests pass
• Backward-compatible — no public API changes

[changeset-bot]

⚠️ No Changeset found

Latest commit: 86c186a

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[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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