Hoist the fast-mode rate sets into OPUS_46_47_FAST_RATES and
OPUS_48_FAST_RATES module constants (built via buildRates) so the
registry entries reference shared values instead of repeating literal
buildRates(...) calls. Also wires the fast tier onto the -thinking
aliases (claude-opus-4-6-thinking / -4-7-thinking) so they bill at the
same premium as their base ids.
Built [OnSteroids](https://onsteroids.ai)
Sergey Galuza
e8057a7073