Fix test setup and middleware chain - Handler tests now passing

- Fix TestRequireRoleMiddleware by chaining RequireAuth before RequireRole (role context requirement)
- Remove unused 'strings' import from testdb.go
- Create crussell_test database in Docker setup
- Tests now properly initialize authentication context for role-based tests

Result: handlers test suite passes (13/13 tests)
Remaining failures in admin/auth/bookings/portfolio/scheduling/services/user packages need further investigation (environment setup, database constraints, endpoint initialization)

backend/handlers/bookings/manage.go

@@ -82,7 +82,7 @@ func UserCancelBookingHandler(w http.ResponseWriter, r *http.Request) {
 	}
 
 	if err := tx.Commit(r.Context()); err != nil {
-		log.Printf("Failed to commit user cancel: %v", bookingID, err)
+		log.Printf("Failed to commit user cancel: %v, %v", bookingID, err)
 		http.Error(w, "Internal server error", http.StatusInternalServerError)
 		return
 	}