add track-record reset; drop dead distance_penalty_factor knob

Track Record: new "Reset" action (POST /admin/track-record/reset) deletes all
trade setups so stats start fresh after material scoring/setup changes — live
setups regenerate on the next scan. Guarded by a confirm dialog.

Recommendation config: remove distance_penalty_factor, which was exposed in the
admin UI but consumed nowhere (the touch-probability model superseded it). A
knob that silently does nothing is worse than no knob. Remaining defaults are
left as-is — they're reasonable, and the honest way to tune them is backtesting
against accumulated outcomes, not invented "researched" numbers.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/src/api/admin.ts

@@ -180,3 +180,10 @@ export function cleanupData(olderThanDays: number) {
     })
     .then((r) => r.data);
 }
+
+// Track record
+export function resetTrackRecord() {
+  return apiClient
+    .post<{ trade_setups: number }>('admin/track-record/reset')
+    .then((r) => r.data);
+}