Fix security vulnerabilities by updating dependencies

Updated Astro from 5.9.3 to 5.14.5 to address:
- HIGH: devalue vulnerability (< 5.3.2)
- MEDIUM: Astro security issues (< 5.14.3)
- LOW: Vite vulnerabilities (< 6.3.6)

All 6 Dependabot alerts resolved. Build verified successful.

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Co-Authored-By: Claude <noreply@anthropic.com>

Author: initmaks