🛡️ Sentinel: [CRITICAL] Fix missing authentication on sensitive endpoints

[shadowcoder8]

🚨 Severity: CRITICAL
💡 Vulnerability: Several core API endpoints and management pages (/labours/, /attendance/, /materials/, /sites/, /payments/, /materials-management/, /payment-management/) were missing authentication checks.
🎯 Impact: This vulnerability allowed unauthenticated users to access sensitive data and perform CRUD operations, completely bypassing authorization.
🔧 Fix: Added dependencies=[Depends(get_current_user)] to the route decorators for all affected endpoints to enforce authentication.
✅ Verification: Added automated checks using Pytest. Tested the endpoints to ensure they now require an authenticated session. Recorded the vulnerability and prevention steps in .jules/sentinel.md.

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PR created automatically by Jules for task 12915075063989236188 started by @shadowcoder8

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