fix: 部分收付累计释额并扩展结算 E2E 与 CI

账期收付改为按累计已付同步 credit_ledger，修复多笔 partial_paid 与坏账核销重复释额；新增 API E2E（占成、权限、部分收付/坏账）与 GitHub Actions e2e-api job。

Co-authored-by: Cursor <cursoragent@cursor.com>

app/Services/AgentSettlement/AgentSettlementBadDebtService.php

@@ -105,7 +105,8 @@ final class AgentSettlementBadDebtService
             if ((string) $original->owner_type === 'player' && (int) $original->owner_id > 0 && (int) $original->net_amount > 0) {
                 $player = Player::query()->find((int) $original->owner_id);
                 if ($player !== null) {
-                    $this->playerCreditService->releaseFromSettlement($player, $unpaid, $originalBillId);
+                    $cumulativePaid = (int) $original->paid_amount + $unpaid;
+                    $this->playerCreditService->releaseFromSettlement($player, $cumulativePaid, $originalBillId);
                 }
             }