Add backend foundation and config-driven workbench

backend/internal/service/me_service.go

@@ -0,0 +1,43 @@
+package service
+
+import (
+	"context"
+	"net/http"
+
+	"cmr-backend/internal/apperr"
+	"cmr-backend/internal/store/postgres"
+)
+
+type MeService struct {
+	store *postgres.Store
+}
+
+type MeResult struct {
+	ID        string  `json:"id"`
+	PublicID  string  `json:"publicId"`
+	Status    string  `json:"status"`
+	Nickname  *string `json:"nickname,omitempty"`
+	AvatarURL *string `json:"avatarUrl,omitempty"`
+}
+
+func NewMeService(store *postgres.Store) *MeService {
+	return &MeService{store: store}
+}
+
+func (s *MeService) GetMe(ctx context.Context, userID string) (*MeResult, error) {
+	user, err := s.store.GetUserByID(ctx, s.store.Pool(), userID)
+	if err != nil {
+		return nil, err
+	}
+	if user == nil {
+		return nil, apperr.New(http.StatusNotFound, "user_not_found", "user not found")
+	}
+
+	return &MeResult{
+		ID:        user.ID,
+		PublicID:  user.PublicID,
+		Status:    user.Status,
+		Nickname:  user.Nickname,
+		AvatarURL: user.AvatarURL,
+	}, nil
+}