[KW-604] feat: grpc 구현 및 util class 추가

[coffeesigma]

🔷 Jira Ticket ID

KW-604

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📌 작업 내용 및 특이사항

• tenant에 wallet token 변경할 수 있는 grpc client 구현

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📚 참고사항

[Copilot]

Pull Request Overview

This PR adds a JSON utility for loading token mappings and implements a gRPC client to update tenant wallet tokens.

• Introduce JsonToMap utility to read a JSON file into a Map<String, String>.
• Implement HospitalTenantClient to send an UpdateTokensRequest via gRPC to the tenant service.

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
src/main/java/com/doubleo/didagent/util/JsonToMap.java	Utility to deserialize JSON into a string map
src/main/java/com/doubleo/didagent/grpc/client/HospitalTenantClient.java	gRPC client for updating tenant wallet tokens

Comments suppressed due to low confidence (3)

src/main/java/com/doubleo/didagent/util/JsonToMap.java:9

• [nitpick] Consider adding unit tests for this utility to verify JSON loading behavior and error handling for invalid or missing files.

public class JsonToMap {

src/main/java/com/doubleo/didagent/grpc/client/HospitalTenantClient.java:20

• [nitpick] Add JavaDoc to describe the method’s behavior, expected input map format, and possible exceptions.

public UpdateTokensResponse updateTokens(Map<String, String> tokens) {

src/main/java/com/doubleo/didagent/grpc/client/HospitalTenantClient.java:15

• [nitpick] Consider adding unit or integration tests to cover the gRPC call, including success and failure scenarios.

public class HospitalTenantClient {

[willjsw]

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