chore: add backlog task for Stripe configuration

Track remaining work to enable registration payments:
- Get Stripe credentials from CCG organizers
- Configure environment variables
- Set up webhook endpoint
- Test payment flow

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backlog/config.yml

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+project_name: "Crypto Commons Gathering"
+default_status: "To Do"
+statuses: ["To Do", "In Progress", "Done"]
+labels: []
+milestones: []
+date_format: yyyy-mm-dd
+max_column_width: 20
+default_editor: "vim"
+auto_open_browser: true
+default_port: 6420
+remote_operations: true
+auto_commit: false
+bypass_git_hooks: false
+check_active_branches: true
+active_branch_days: 30

backlog/tasks/task-1 - Configure-Stripe-for-CCG-registration-payments.md

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+---
+id: task-1
+title: Configure Stripe for CCG registration payments
+status: To Do
+assignee: []
+created_date: '2025-12-06 15:14'
+labels: []
+dependencies: []
+priority: high
+---
+
+## Description
+
+<!-- SECTION:DESCRIPTION:BEGIN -->
+Add Stripe API keys to enable ticket purchases and registration payments for Crypto Commons Gathering 2026
+<!-- SECTION:DESCRIPTION:END -->
+
+## Acceptance Criteria
+<!-- AC:BEGIN -->
+- [ ] #1 Get Stripe account credentials from CCG organizers
+- [ ] #2 Add STRIPE_SECRET_KEY to .env
+- [ ] #3 Add STRIPE_WEBHOOK_SECRET to .env
+- [ ] #4 Add NEXT_PUBLIC_STRIPE_PUBLISHABLE_KEY to .env
+- [ ] #5 Create webhook endpoint in Stripe dashboard pointing to https://cryptocommonsgather.ing/api/webhook
+- [ ] #6 Test registration payment flow
+<!-- AC:END -->