v2.1.38

## What's Changed
* feat(ci): upload swagger to s3 by @Piyush-Goenka in https://github.com/flexprice/flexprice/pull/3061
* feat(activity): activity log for 12 billing entities by @aghijap in https://github.com/flexprice/flexprice/pull/3041
* ci: scope the spec invalidation and verify it against the release by @agrim123 in https://github.com/flexprice/flexprice/pull/3067
* fix(analytics): return zero usage when there is no subscription context by @DiabolusGX in https://github.com/flexprice/flexprice/pull/3036
* feat(zoho): re-sync an invoice that is already in Zoho Books by @Harshit-1104 in https://github.com/flexprice/flexprice/pull/3052
* fix(api): rename cancel_immediately_inovice_policy to cancel_immediately_invoice_policy (FLE-784) by @aghijap in https://github.com/flexprice/flexprice/pull/3071
* fix(storage): check customer S3 buckets when an export is created, not at connect by @aghijap in https://github.com/flexprice/flexprice/pull/3073
* feat(invoice): end of month payment terms, counted from the issue date by @Harshit-1104 in https://github.com/flexprice/flexprice/pull/3069
* Release 2026-10-14 by @flexprice-automation in https://github.com/flexprice/flexprice/pull/3074
* feat(price): add support for addon price sync by @subratsahilgupta in https://github.com/flexprice/flexprice/pull/3060
* feat(grouped-invoicing): invoice child modifications to the parent and batch addon changes across a group by @Harshit-1104 in https://github.com/flexprice/flexprice/pull/3042
* Release 14-10-2026 #2 by @subratsahilgupta in https://github.com/flexprice/flexprice/pull/3076


**Full Changelog**: https://github.com/flexprice/flexprice/compare/v2.1.37...v2.1.38