feat: add oracle price fallback for custom-priced tokens #29
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Some collateral tokens don't appear in the pools api or coingecko, causing getUsdRate() to return 0. These assets rely on custom oracles that chain multiple Curve pools or vault exchange rates. When both primary sources fail, fall back to https://prices.curve.finance/v1/lending/markets to retrieve the oracle-reported price. This restores missing USD values for lending markets that use custom oracles.
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Some collateral tokens used in lending markets don't have Curve pool data or CoinGecko prices available for getUsdRate(), resulting in their collateral values displaying as $0.
This PR adds a fallback mechanism that retrieves oracle prices from the lending markets API when neither pools nor CoinGecko can provide pricing data.
The oracle prices are fetched from https://prices.curve.finance/v1/lending/markets and converted from crvUSD to USD, ensuring all lending market collateral displays accurate values.