By Sandra Stojanovic VENTURA, California (Reuters) – Beachfront California residents on Friday cleaned up from flood damage unleashed by massive waves that pounded the coastline a day earlier and braced for another bout of extreme surf and heavy showers forecast into the weekend. The National Weather Service (NWS) posted high surf and coastal flood warnings for much of the California shoreline from San Diego north to the San Francisco Bay area, with breaking waves expected to reach 20, 25 and even 40 feet (12 m) in height in some areas. The treacherous surf and coastal flood threat was attribu…