test: add comprehensive tests for InvoiceService

Covers invoice generation from orders and renewals, line item copying,
tax calculations, PDF generation/retrieval, email sending, status
transitions, workspace queries, model scopes, and relationships.

Fixes #5

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Claude 2026-03-24 16:25:33 +00:00
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commit b624757c3c
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