feat: implement user profile retrieval with roles and permissions caching

internal/repositories/auth_repository.go

@@ -7,6 +7,7 @@ import (
 	"wm-backend/internal/models"
 	db "wm-backend/sqlc_gen"
 
+	"github.com/google/uuid"
 	"github.com/jackc/pgx/v5"
 )
 
@@ -43,3 +44,20 @@ func CreateUser(ctx context.Context, queries *db.Queries, params db.CreateUserPa
 	}
 	return id.String(), nil
 }
+
+// GetUserByID retrieves a user by their ID using SQLC-generated queries.
+// Returns nil, nil if no user is found.
+func GetUserByID(ctx context.Context, queries *db.Queries, id string) (*models.User, error) {
+	uid, err := uuid.Parse(id)
+	if err != nil {
+		return nil, err
+	}
+	user, err := queries.GetUserByID(ctx, uid)
+	if err != nil {
+		if errors.Is(err, pgx.ErrNoRows) {
+			return nil, nil
+		}
+		return nil, err
+	}
+	return mapper.ToDomainUser(user), nil
+}