fix(registry): add timeout and use HEAD request in registryValidation

[sungdark]

Description

Fixes #2027 - CLI hangs indefinitely when --registry-url points to an unreachable host (no timeout handling).

Changes

• Add AbortController with 5s timeout to prevent indefinite hangs when registry is unreachable
• Use HEAD request instead of GET for lighter network footprint
• Meaningful timeout error message: Registry URL timed out after 5s: <url>. The host is unreachable or too slow.
• Unit tests added for registryURLParser and registryValidation including timeout behavior

Root Cause

The original registryValidation() in src/utils/generate/registry.ts called fetch() without:

• No AbortController / timeout
• No signal to abort
• Used default GET (downloads full response body unnecessarily)
• Error message was opaque

Testing

# Before fix — hangs indefinitely:
asyncapi generate fromTemplate asyncapi.yaml @asyncapi/html-template --registry-url http://10.255.255.1

# After fix — fails fast with clear message:
# Error: Registry URL timed out after 5s: http://10.255.255.1. The host is unreachable or too slow.

Files Changed

• src/utils/generate/registry.ts — add timeout, use HEAD, proper error messages
• test/unit/utils/registry.test.ts — new unit tests

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Latest commit: b25fda3

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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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