Allow channels to configure independent model pricing for account
statistics cost calculation, decoupled from user billing.
Backend:
- Migration 101: channels.apply_pricing_to_account_stats toggle,
channel_account_stats_pricing_rules/model_pricing tables,
usage_logs.account_stats_cost column
- resolveAccountStatsCost: match rules by group/account, then channel
pricing, fallback to original formula when unconfigured
- Integrate into both GatewayService.recordUsageCore and
OpenAIGatewayService.RecordUsage
- Update 8 account stats SQL queries to use
COALESCE(account_stats_cost, total_cost) * account_rate_multiplier
- 23 unit tests for matching, pricing lookup, and cost calculation
Frontend:
- Channel edit dialog: toggle + custom rules UI with group/account
multi-select and pricing entry cards
- API types and i18n (zh/en)
