implement paginated document endpoints, land ownership transfer, role…

[feyishola]

…-guarded admin endpoints, and health checks

closes #230

closes #231

closes #232

closes #233

Document Endpoints:

• Add paginated GET /api/documents with filters for status, risk score, date range, and title search

Land Ownership Transfer:

• Build transfer endpoints that record seller-buyer events
• Anchor transaction records on Stellar blockchain for immutability

Admin Endpoints:

• Create role-guarded admin endpoints for paginated user management
• Add role-guarded admin endpoints for paginated document management

Health Monitoring:

• Expose /api/health endpoint reporting live status of:
  • Database connectivity
  • Redis cache/queue health
  • Stellar network dependency status

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