Enforce Audit Logging for Key Business Actions

[grantfox-oss]

Description:
Audit logs exist in Prisma, but controller coverage is partial. Ensure key actions across AuthController, CampaignController, DonationController, DistributionController, and BeneficiaryController are logged consistently via audit.ts or direct service calls.

[GBOYEE]

Hi! I'd like to work on this issue.

I have experience with this stack and can deliver a clean, tested solution. Please assign this to me and I'll submit a PR shortly.

My approach:

• Analyze the root cause
• Implement a fix following existing code patterns
• Add tests and documentation

Thanks!