Make attestation and verification synchronous

[MYRhouma]

Replaces the previous async RabbitMQ-backed attestation flow with a synchronous POST /attestation that returns the AoV JWS inline and a POST /attestation/verify that delegates to dva-vc-manager.

• /attestation validates vlaId (UUID parse), fetches the VLA from vla-manager-api, batches evaluation against dva-processing, and on success asks dva-vc-manager to issue the JWS; on failure returns 200 with evaluationPassing=false and jws=null
• /attestation/verify forwards the JWS to dva-vc-manager
• dataProvider is used as the VC subject (falls back to attesterID)
• OpenAPI spec updated
• AoVSyncRoutesTest (4 unit tests) covers pass/fail issue and verified true/false verify paths using a MockEngine-backed HttpClient; ktor-client-mock dependency added
• obsolete async AoVRoutesTest.kt removed (superseded by AoVSyncRoutesTest.kt)

Depends on: #72 (ACA-Py removal), #73 (dva-vc-manager), #74 (vla-manager-api), #75 (slim dva-api-processing)

@bzp99

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