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test: fix checkout tests to mock customerService

Update all checkout tests to:
- Add customerService mock to test setup
- Mock GetByOrgID calls for inferring billing_id from org_id
- Add org_id to all test requests
- All 24 test cases now passing

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

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