Dependency vulnerability scanning

[Xaxxoo]

Description

Briefly describe what this PR does.

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Related Issue

Closes #

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Test Plan

• Tested locally
• Verified expected behavior
• No regressions introduced

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Screenshots (if applicable)

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Checklist

• Code builds successfully

Clsoes #139

• Tests pass
• Follows project conventions
• No sensitive data exposed

[drips-wave]

Hey @Xaxxoo! 👋 It looks like this PR isn't linked to any issue.

If this PR is for one of the issues assigned to you as part of a Wave, please link it to ensure your contribution is tracked properly. You can do this by adding a keyword to the PR description (e.g., Closes #123), or by clicking a button below:

Issue	Title
#140	VirtualCard Soroban contract is unimplemented — only interface stubs exist	Link to this issue
#147	Feature: Implement subscription renewal history timeline view	Link to this issue
#139	Add dependency vulnerability scanning (npm audit) to CI pipeline	Link to this issue
#194	Feature: Add public API documentation site and developer portal	Link to this issue

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