STOCKTON — Dramatic scenes unfolded Thursday evening as more than 50 firefighters battled a four-alarm blaze that consumed at least three buildings, caused loud explosions and filled the south Stockton air with thick, black smoke.Zaid Gonzalez, 17, an employee of Customs Catering Service, watched from a safe distance as his uncle’s business burned to the ground.“We’ve been working in our shop for many years, and watching it burn down hurts us, [...]