🔒 Security Fix: Prevent path traversal in widearea-dns

[mgabrielramos]

🎯 What: Patched a Path Traversal vulnerability in src/infra/widearea-dns.ts.
⚠️ Risk: An attacker could potentially overwrite arbitrary files by manipulating the domain name parameter in the wide-area DNS zone generation. This could lead to system compromise or denial of service.
🛡️ Solution:

• Added strict validation to getWideAreaZonePath to reject domains containing / or \ or ...
• Added unit tests in src/infra/widearea-dns.test.ts to verify the security fix and ensure valid domains are still processed correctly.

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PR created automatically by Jules for task 12725102419194057851 started by @mgabrielramos

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