The cash-strapped San Antonio Symphony will end its season more than a month early, and attempt to retool its finances in order to have the funds to mount a full 2003-04 season. The orchestra has been in dire straits for months, with its musicians frequently playing without pay. Orchestra officials say they are optimistic about plans for next season, but acknowledge that the new season may be a shorter one, and might not happen at all if new sources of local funding can’t be found.