chore: Remove high vulnerabilities (M2-9964)

[divbzero]

📝 Description

🔗 Jira Ticket M2-9964

• npm audit fix to remove vulnerabilities
• Upgrade Node 22.15.x → 24.x.x
• Update ESLint 8.57.1 → 9.39.1
• Migrate .eslintrc.js → eslint.config.js

npm audit before:

10 vulnerabilities (1 low, 4 moderate, 5 high)

npm audit after:

3 vulnerabilities (1 low, 2 moderate)

🪤 Peer Testing

Setup:

• git checkout M2-9964-remove-high-vulnerabilities
• Configure keys and outputs directories as described in README

Run tests:

npm test

Run app:

docker build -t mindlogger-report-server:latest .
docker run -d -v "./keys:/app/keys" -p "3000:3000"  --name mindlogger-report-server mindlogger-report-server:latest

[divbzero]

@aweiland noticed that we added eslint.config.js as part of the ESLint upgrade. Removed obsolete .eslintrc.js in commit b3d55b1.