fix: correct base64 detection for ENCRYPTION_KEY

[yb175]

Context

Local development was failing with a 502 Bad Gateway on /login. Backend logs revealed KMS initialization failing due to Invalid key length.

The root cause: inverted logic when checking if ENCRYPTION_KEY is base64-encoded. The condition !envConfig.ENCRYPTION_KEY was treating a present key as missing, causing it to be decoded as UTF-8 instead of base64. This resulted in a 44-byte buffer instead of the required 32 bytes for AES-256-GCM.

Fix

Changed the condition to !!envConfig.ENCRYPTION_KEY, so base64-encoded keys are correctly decoded when present.

Verification

1. Set up the project locally with default dev config
2. Start backend and frontend
3. Navigate to /login
4. Before: 502 Bad Gateway + Invalid key length in logs
5. After: Backend starts cleanly, /login loads successfully

Type

• Fix
• Feature
• Improvement
• Breaking
• Docs
• Chore

Checklist

• Title follows conventional commit format
• Tested locally
• Updated docs (if needed)
• Updated CLAUDE.md files (if needed)
• Read the contributing guide

[claude]

Claude Code Review

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[maidul98]

✅ Snyk checks have passed. No issues have been found so far.

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