Introduce Stripe integration for automatic payment ingestion and refund
tracking. Adds new fields to the payment model for Stripe IDs and
status,
Stripe client driver, sync service, cron job, manual API endpoint, and
public webhook handler for real-time updates. Includes tests and
documentation. Manual cash entry remains supported.
Updated Go version to 1.24 and upgraded dependencies to their latest
compatible versions. This includes updates to Dockerfiles, go.mod,
and go.sum. Regenerated templated files with templ v0.3.857.
