`updateDexConfig()` in `poolAdminFacet` ignores pair-specific DEX fees

The updateDexConfig() function in PoolAdminFacet sets a single fee value per DEX router address:

function updateDexConfig(address router, uint24 fee, bool isValid)
    external
    onlyRole(AccessControlStorage.DEFAULT_ADMIN_ROLE)
{
    PoolStorage.Dex storage dex = PoolStorage.layout().setUp.dex;
    dex.valid[router] = isValid;
@>  dex.fee[router] = fee;
    emit DexUpdated(router, isValid, fee);
}

However, this structure fails to accommodate DEXes like Uniswap V3, which supports multiple pools per token pair with different fees (e.g., 500, 3000, 10000). Using a single fee for all swaps on a given router can result in a revert or higher slippage in _swapAssetToAsset function.

Recommendations:

Update the design to allow pair-specific fee configuration.