fix(strata-markets): read projected APR for nOPAL zero-projection mode (#2921)

nOPAL uses zero-projection mode where the AprPairFeed returns (0,0)
for accounting purposes, but the real base APR is available via
provider.getAprPairProjected(). CDOLens only reads the feed, so
it returns 0% for nOPAL.

Added a fallback: when CDOLens returns all-zero APRs and a provider
is configured, read getAprPairProjected() directly from the provider
to get the real base APR (~10.15%).