MARSEILLE, France — Violence at a drug trafficking hotspot in the social housing complex next to Orange’s headquarters in Marseille forced the telecoms giant to lock its forest-green gates and order its thousands of employees to work from home. The disruption to such a recognizable company — one that gives its name to the city’s iconic football venue — became a fresh symbol of how drug trafficking and insecurity are reshaping politics ahead of municipal elections. In  a recent poll , security