SANTA ROSA, Calif. — Even before fire wiped out the home she rented for 17 years, Suzanne Finzell had thought about leaving this city on the edge of the San Francisco Bay Area because of rising prices. A spike in housing and other living costs had driven her friends to Nevada and Oregon. Now, Finzell wonders if that will be her fate too, as the wildfires that charred California wine country send thousands of people who lost their homes scrambling for new places to live in one of the nation’s tightest and most expensive housing markets. Before the fires, the rental vacancy rate was a mere 1 percent in Santa Rosa and 3 percent in surrounding Sonoma County.