feat(prov_servidor): add many2many integrations linking

- ProvServidor model: add Integraciones []Submodules (many2many:prov_servidor_submodules)
- GetAllProvServidor: preload Integraciones
- SetProvServidorIntegraciones: new model func to replace associations
- New endpoint PUT /app/provservidor/:id/integraciones
- GetSubmodules: support ?limit= query param
- prov_servidor.html: show integrations as badges in table, view modal,
  and edit modal with checkboxes to select one or more existing submodules

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

rest/routes/user.go

@@ -85,6 +85,7 @@ func UserRoutes(app fiber.Router) {
 	protected.Get("/loadprovservidor", controllers.GetProvServidor)
 	protected.Post("/provservidor", controllers.CreateProvServidor)
 	protected.Put("/provservidor/:id", controllers.UpdateProvServidor)
+	protected.Put("/provservidor/:id/integraciones", controllers.SetProvServidorIntegraciones)
 	protected.Delete("/provservidor/:id", controllers.DeleteProvServidor)
 
 	// Rutas de tipos de servidor