docs: add security policy

[hermes-alby]

Summary

• add a SECURITY.md with private vulnerability reporting guidance
• document GitHub private vulnerability reporting and security@getalby.com as contact options

Verification

• git diff --cached --check

Summary by CodeRabbit

• Documentation
  • Added a security policy covering vulnerability reporting channels and required report details.
  • Documented how security investigations and communications are handled.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 688ae66a-1ab0-4ff3-ac17-b208a6dde1ef

📥 Commits

Reviewing files that changed from the base of the PR and between 3fd8f94 and 30f9aa7.

📒 Files selected for processing (1)

• SECURITY.md

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📝 Walkthrough

Walkthrough

Added SECURITY.md with confidential vulnerability reporting channels, required report details, and investigation communication guidance.

Changes

Security Policy

Layer / File(s)	Summary
Vulnerability reporting guidance SECURITY.md	Defines private GitHub and email reporting channels, required reproduction and impact details, and reporter follow-up communication.

Estimated code review effort: 1 (Trivial) | ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the addition of the security policy.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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