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

[shadowcoder8]

Severity: CRITICAL
Vulnerability: Several core API endpoints (/labours/, /attendance/, /materials/, /sites/, and /payments/) and management routes were exposed without authentication, allowing unauthenticated users to perform administrative actions.
Impact: Unauthorized users could potentially read, create, modify, or delete sensitive data across all major modules of the application.
Fix: Added dependencies=[Depends(get_current_user)] to all relevant unauthenticated FastAPI route decorators in main.py.
Verification: Reviewed main.py diff to ensure the dependencies were successfully added to all protected routes without interfering with public paths. All backend pytest unit tests passed confirming that internal functionality works properly. Also added the fix details to .jules/sentinel.md journal.

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PR created automatically by Jules for task 2204499578070148971 started by @shadowcoder8

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