apply copier update: switch to LemonSqueezy payment provider

Update from materia_saas_boilerplate template with payment_provider=lemonsqueezy.
Adds full LemonSqueezy billing routes (checkout, webhooks, subscription management),
HMAC webhook verification, subscriptions/API keys schema, and removes Caddy in favor
of Nginx Proxy Manager.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.copier-answers.yml

@@ -1,10 +1,10 @@
 # Changes here will be overwritten by Copier; NEVER EDIT MANUALLY
-_commit: 6a0c868
+_commit: c920923
 _src_path: /home/Deeman/Projects/materia_saas_boilerplate
 author_email: ''
 author_name: ''
 base_url: https://padelnomics.io
 description: Plan, finance, and build your padel business
-include_paddle: false
+payment_provider: lemonsqueezy
 project_name: Padelnomics
 project_slug: padelnomics