feat: add credentials route

[ctol3r]

Summary

• add Express app skeleton
• implement /credentials route returning issued/received credentials
• test credentials endpoint

Testing

• npm test
• npm run build

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Codex Task

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Note

Implements a minimal backend API and test scaffolding.

• Adds Express app (backend/src/app.ts) and mounts credential_controller
• Implements GET /credentials returning placeholder issued and received arrays
• Adds Jest/ts-jest config and a supertest test for the endpoint
• Adds .gitignore entries for node_modules/ and dist/

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