Indonesia has become the latest election battleground for Beijing's soaring economic clout, as the opposition warns pro-China policies are saddling the mineral-rich archipelago with bad debt as it is sold off piecemeal to foreign interests.Business links with top trade partner China have been thrust into the spotlight by ex-general Prabowo Subianto who is challenging Indonesian leader Joko Widodo for the presidency of Southeast Asia's largest economy on Wednesday.Trailing by double