feat: 新增赔率版本和玩法配置版本的删除接口，支持删除草稿版本

app/Services/Config/RiskCapStreamService.php

@@ -131,6 +131,26 @@ final class RiskCapStreamService
         );
     }
 
+    public function deleteVersion(RiskCapVersion $version, AdminUser $admin, ?Request $request = null): void
+    {
+        $before = $this->snapshotVersion($version);
+
+        DB::transaction(function () use ($version): void {
+            $version->delete();
+        });
+
+        AuditLogger::recordForAdmin(
+            $admin,
+            $request,
+            moduleCode: 'risk_cap',
+            actionCode: 'delete',
+            targetType: 'risk_cap_version',
+            targetId: (string) $version->id,
+            beforeJson: $before,
+            afterJson: null,
+        );
+    }
+
     /** @return array<string, mixed> */
     private function snapshotVersion(RiskCapVersion $v): array
     {