feat(server): use reearth-accounts api client pkg instead of using self implementation

[soneda-yuya]

Overview

This branch integrates the Re:Earth Accounts API client
package to replace the self-implemented authentication
system, improving the authentication architecture and
removing code duplication.

Key Changes

Authentication System Refactoring:

• Replaced self-implemented auth logic with
  github.com/reearth/reearth-accounts/server client
  package
• Updated auth middleware to use the new accounts API
  client
• Modified user queries to fetch data from accounts
  service (GetMe endpoint)
• Added auth transport layer for proper token handling

Notable Files Changed:

• server/internal/adapter/accounts/auth_transport.go:
  New auth transport implementation
• server/internal/app/auth_client.go: Refactored to use
  accounts API client
• server/internal/adapter/gql/resolver_user.go: Updated
  user resolver methods
• Multiple middleware and context files updated for new
  auth flow

Dependency Updates:

• Added github.com/reearth/reearth-accounts/server as a
  dependency
• Updated related Go modules and dependencies

Impact

• Centralizes authentication logic through the accounts
  service
• Removes maintenance burden of custom auth
  implementation
• Improves consistency across Re:Earth services
• Sets foundation for future auth features from the
  accounts service

What I've done

What I haven't done

How I tested

Which point I want you to review particularly

Memo

[Copilot]

Pull Request Overview

This PR migrates from an internal accounts infrastructure to using the external reearth-accounts server client library. The changes involve replacing custom GraphQL client code with a standardized client library and updating dependencies.

Key Changes:

• Replaced internal server/internal/infrastructure/accounts package with github.com/reearth/reearth-accounts/server/pkg/gqlclient
• Added new dependency: github.com/reearth/reearth-accounts/server v0.0.0-20251029041058-19ad61a40385
• Updated numerous Go dependencies to newer versions
• Generated mock for user.Repo interface using go-mock

Reviewed Changes

Copilot reviewed 21 out of 22 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
server/pkg/user/mockrepo/mockrepo.go	Generated mock implementation for user repository
server/internal/infrastructure/accounts/*	Removed internal accounts infrastructure (client, repos, models)
server/internal/adapter/gql/resolver.go	Updated to use external gqlclient.Client
server/internal/app/*.go	Updated imports and client initialization
server/go.mod	Added reearth-accounts dependency and updated dependencies
server/go.sum	Updated dependency checksums

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