Wire a curated set of crypto assets (BTC, ETH, SOL, XRP, DOGE, ADA, LTC)
into the !fx conversion path only. fxLivePairRate now resolves each side
to units-per-USD and crosses them, so USD/fiat/crypto mix uniformly; fiat
sides still batch into one Frankfurter call, crypto hits CoinGecko's
keyless simple/price with a 60s cache.
Analysis (rate/report/setalert) stays fiat-only on purpose -- a daily
snapshot buy-signal/52w range is meaningless for 24/7 crypto.
