The DeepSeek branch in _detectModelOptimizations matched only V3
and R1 literally. DeepSeek-V4-Flash (and future Vx / Rx) didn't
hit any branch, so the Expert Parallel checkbox + Speculative
defaults never surfaced in the Run panel. Widened to a regex that
catches v3/v3.1/v4/v5/v10+ and r1/r2/… for both the expert-parallel
flag and the MTP speculative defaults.