Clv History

Batch CLV history grader with date-range + period-market coverage.

Body:

{
  "bets": [<bet>, ...],                   # same shape as /v1/clv
  "date_from": "YYYY-MM-DD",              # optional, inclusive
  "date_to":   "YYYY-MM-DD",              # optional, inclusive
  "sharp_book": "pinnacle",               # optional, default pinnacle
  "include_period_archive": false,        # optional, default false
  "period_key": "Q1",                     # required when include_period_archive
                                          # AND any bet's market is a period market
}

Cost: max(15, 10 + 3 * len(bets)).

Gated by CLV_HISTORY_ENABLED=1. Default OFF; returns 503 with explanatory body when disabled.