Add vpatch rules for CVE-2026-20127 (Cisco SD-WAN vManage Pre-Auth RCE)

[buixor]

Two rules covering the full exploit chain:

• vpatch-CVE-2026-20127: blocks path-traversal WAR upload to /dataservice/smartLicensing/uploadAck (step 3 - direct RCE trigger)
• vpatch-CVE-2026-20127-dca-disclosure: blocks unauthenticated access to the DCA credential file at /reports/data/.../data-collection-agent/.dca (step 1 - cred theft)

Both rules validated, linted, and live-tested via the WAF harness.

[github-actions]

Hello @buixor,

✅ The new VPATCH Rule is compliant, thank you for your contribution!

[github-actions]

Hello @buixor and thank you for your contribution!

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