feat: Implementar suite completa de tests de integración v1.9.0

- Agregar 46 tests de integración (auth, multi-tenancy, tickets)
- Crear estructura organizada tests/integration/ y tests/unit/
- Implementar fixtures completas para testing con BD separada
- Agregar conftest_integration.py con setup async
- Mover scripts PowerShell de testing a tests/scripts/
- Actualizar pytest.ini con markers y configuración
- Crear run_tests.sh script ejecutable para testing
- Documentación completa en README_TESTS.md
- Fix: Remover opciones obsoletas de TypeScript (importsNotUsedAsValues)

Tests implementados:
- Authentication: 15 tests (login, refresh, permisos, seguridad)
- Multi-tenancy: 13 tests (aislamiento, validaciones, seguridad B2B)
- Tickets: 18 tests (CRUD, filtros, permisos por rol)
- Unit: 10 tests básicos
- Verificación: 8 tests de setup

Base de datos de testing: servicemanager_test (separada de producción)
Cobertura estimada: ~40% (desde 5%)

Próximos pasos: Agregar tests de SLA, attachments, auditoría

backend/tests/unit/test_health.py

@@ -0,0 +1,50 @@
+"""
+Tests for Health Check endpoints - ServiceManagerWeb
+
+Tests básicos para verificar que la configuración de testing funciona
+"""
+
+import pytest
+import asyncio
+
+
+@pytest.mark.asyncio
+async def test_health_check_async():
+    """Test that async operations work in testing."""
+    # Simple async test to verify setup
+    await asyncio.sleep(0.01)
+    assert True
+
+
+def test_basic_math():
+    """Test basic functionality."""
+    assert 1 + 1 == 2
+
+
+# Test básico de importación de módulos principales
+def test_imports():
+    """Test that core modules can be imported without errors."""
+    try:
+        from app.core.config import get_settings
+        from app.core.security import security
+        
+        # Test que las funciones básicas existen
+        assert get_settings is not None
+        assert security is not None
+        assert hasattr(security, 'hash_password')
+        assert hasattr(security, 'verify_password')
+        
+    except ImportError as e:
+        pytest.fail(f"Failed to import core modules: {e}")
+
+
+def test_security_functions():
+    """Test basic security functions."""
+    from app.core.security import security
+    
+    password = "TestPassword123!"
+    hashed = security.hash_password(password)
+    
+    assert hashed != password  # Should be hashed
+    assert security.verify_password(password, hashed)  # Should verify
+    assert not security.verify_password("wrong", hashed)  # Should not verify wrong password