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

[shadowcoder8]

🚨 Severity: CRITICAL
💡 Vulnerability: Missing authentication decorators on sensitive API endpoints (e.g., /labours/, /attendance/, /materials/, /sites/, /payments/) and management routes.
🎯 Impact: Unauthenticated users could view, create, update, or delete sensitive data and access management pages, leading to massive data leaks and integrity loss.
🔧 Fix: Added dependencies=[Depends(get_current_user)] to all relevant route decorators in main.py to enforce authentication globally across sensitive paths.
✅ Verification: Verified via tests checking that unauthenticated requests to /labours/ return a 401 Unauthorized status, and confirmed the change does not break the test suite. Also updated the Sentinel journal with these learnings.

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PR created automatically by Jules for task 14299686520343718446 started by @shadowcoder8

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