Fix authorization bypass and input sanitization vulnerabilities in API routes#1

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copilot/fix-security-issue

Commits on Feb 28, 2026

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Copilot
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Fix security vulnerabilities: add ownership checks, prevent userId spoofing, add auth to sendgrid, sanitize HTML

Copilot
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aqzi
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Fix status codes for server errors and remove package-lock.json from tracking

Copilot
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aqzi
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