MIDDLETOWN — The Main Switch Beauty Salon owner Sonia Santavenere was quite content managing her Middletown shop when a client whose hair she was styling asked whether she’d be interested in moving into Fairfield County. Santavenere, who has operated the 390 Washington St. hairdressing shop for 26 years on Route 66 in Middletown, and lives above the shop, specializes in biracial and “overly curly” hair. Some of her clients with challenging locks already drive long distances for her expert services — from as far away as New Hampshire and New York, she said. When posed with the question last year, right off the bat Santavenere was skeptical. “I said, ‘Hell,…