JCK’s ongoing series on the shopping centers finding success amid an ever-changing retail landscape   Beverly Hills has nothing on Bal Harbour, South Florida’s internationally renowned open-air luxury retail paradise “Put this on,” says Bobby Shafer, a ­dapper-suited sales associate at the Gucci boutique at Miami’s Bal Harbour Shops, as he spritzes a silk ribbon with the brand’s latest fragrance, Bloom. He ties the perfumed ribbon around my wrist and clasps both my hands lightly. “Now you can get into any club in South Beach,” he says, flashing a ­thousand-watt smile. “Tell the doormen Bobby sent you.” Tickled by this clever customer service, I float out into the mall’s main thoroughfare, where salty breezes from the nearby Atlantic Ocean softly circulate, commingling with the delicious scents of pricey artisanal candles burning at Diptyque, Santa Maria