Financial services, especially those for people who don’t have access to traditional bank accounts or lines of credit, are proliferating in Southeast Asia. Jeff App wants to give consumers a “super app” where they can compare many financial products and apply for them using the startup’s proprietary data-scoring models. For service providers, Jeff serves as a distribution channel, helping them find and retain customers. The startup announced today it has raised a seed extension of $1.5 million, led by J12 Ventures. Other participants included iSeed Ventures and Toy Ventures, and…