fix(deploy): incorporar cryptography en requirements.txt y robustecer instalador install.sh

backend/requirements.txt

@@ -19,3 +19,4 @@ Babel==2.14.0
 gunicorn>=21.2.0
 PyJWT>=2.8.0
 pydantic>=2.0.0
+cryptography>=42.0.0

backend/tests/test_sprint4_optimizer_and_concurrency.py

@@ -13,6 +13,7 @@ from app.models.genetic_algorithm import (
     Gene
 )
 from app.services.optimizer_service import OptimizerService, OptimizerJobStatus
+from app.services.jwt_service import JWTService
 from config.config import Config