Hundreds of thousands of residents. Thousands of well-paid jobs. Hundreds of millions of dollars in support for home purchases and low-income housing. Tens of millions of dollars in grants for education and training. Offices. Factories. Roads. Schools. Transit. Parks. These are the promises from California Forever, the controversial company backed by Silicon Valley billionaires planning to build a new city from the ground up in Solano County. On Wednesday, the company revealed new details about the for-profit development and a proposed November ballot initiative to change the county’s general …