[KW-682] feat/webhook handler

[willjsw]

🔷 Jira Ticket ID

KW-682

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📌 작업 내용 및 특이사항

• Connection 상태 업데이트 / DID Key 생성 및 등록 / VC 발급을 위한 ACApy Webhook 핸들러 구현

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📚 참고사항

[Copilot]

Pull Request Overview

This PR adds a webhook handler for ACA-Py to manage connection state updates, DID creation/registration, and VC issuance.

• Implements AcapyWebhookService with handlers for connection, credential, and out-of-band webhooks
• Adds new DTOs for ACA-Py request/response payloads
• Updates controller and agent classes to route and log incoming webhooks

Reviewed Changes

Copilot reviewed 15 out of 15 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
service/AcapyWebhookService.java	New webhook processing flows for connection, VC, OOB
controller/AcapyWebhookController.java	Endpoints wired to webhook service with logging
dto/request & dto/response packages	Records for mediator and hospital create/issue flows
agent/HospitalAgent.java & agent/MediatorAgent.java	Calls to ACA-Py endpoints for invitations, DIDs, VCs
dto/request/DidCreateRequest.java & response/DidCreateResponse.java	Deleted legacy DID DTOs

Comments suppressed due to low confidence (1)

src/main/java/com/doubleo/didagent/agent/MediatorAgent.java:33

• [nitpick] The error message references 'MemberConnection fetch' but this method creates a mediator invitation; update the message for clarity.

log.error(
                                    "Mediator MemberConnection fetch error: {}",
                                    error.getMessage());

[midday2612]

P5: 확인했습니다. 고생하셨어요....

[coffeesigma]

장인정신이 보이는 코드네요...
다 만드느라 고생하셨습니다