🛡️ Sentinel: [HIGH] Fix authorization bypass in API

[shadowcoder8]

🚨 Severity: HIGH
💡 Vulnerability: Core API endpoints (such as /labours/, /attendance/, /materials/, /sites/, /payments/) and their management pages were missing authentication checks. Anyone could access and modify sensitive data without being authenticated.
🎯 Impact: Unauthenticated users could view and modify sensitive database records without valid sessions, leading to complete authorization bypass.
🔧 Fix: Added dependencies=[Depends(get_current_user)] to core API endpoints in main.py using standard FastAPI dependency injection to enforce that a valid session exists. Excluded public and already-authenticated routes. Also appended the learning to .jules/sentinel.md.
✅ Verification: Verified using verify_auth.py that endpoints return 401 Unauthorized when requested without valid session cookies. All unit tests successfully passed.

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PR created automatically by Jules for task 17021241007067885048 started by @shadowcoder8

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