Implement decentralized identifier applications for proof identity resolution**

[jobbykings]

Create advanced decentralized identifier applications for proof identity resolution, DID document management, and interoperable identity services.

Requirements:
Decentralized identifier application implementation
Proof identity resolution
DID document management
Interoperable identity services
DID security verification
Resolution efficiency optimization
Acceptance Criteria:
GIVEN DID application, WHEN used, THEN identity is resolved without central authority
GIVEN proof identity, WHEN resolved, THEN DID links to proof credentials
GIVEN document management, WHEN active, THEN DID documents are maintained properly
GIVEN interoperability, WHEN achieved, THEN DIDs work across platforms
GIVEN efficiency optimization, WHEN applied, THEN DID resolution is fast

Files to Work On:

Backend:

backend/src/didapplications/DIDApplications.ts (new)
backend/src/didapplications/IdentityResolver.ts (new)
backend/src/didapplications/DocumentManager.ts (new)
backend/src/didapplications/InteroperabilityService.ts (new)
backend/src/services/DIDApplicationService.ts (new)

Frontend:

frontend/src/components/DIDApplications/IdentityResolver.tsx (new)
frontend/src/components/DIDApplications/DocumentManager.tsx (new)