Miguel Alissandro Tan grew up around his family’s growing business, but leadership wasn’t handed to him. Compelled to step in early as the company grew and his father recovered from heart bypass surgery, he started with everyday work at 18 in sales and collections, then spent years on construction sites learning from engineers and laborers before eventually assuming the role of CEO. Today, as he leads Fasclad Inc. and the MVT Group of Companies, Tan — now 30 years old — is thinking not only about what he can build, but also about a legacy he can leave behind.Fasclad has…