feat: Work Order PDF Generation Service (Story 12.1)

[daveharmswebdev]

Summary

• Add POST /api/v1/work-orders/{id}/pdf endpoint that generates a professional PDF document for any work order
• QuestPDF implementation with all required sections: header with status badge, property info, work order details, vendor/DIY assignment, chronological notes, linked expenses table with totals, photo count note, and branded footer with page numbers
• Follows existing ScheduleE PDF architecture pattern exactly (interface in Application, implementation in Infrastructure, DI in Program.cs)
• 9 new unit tests covering: valid generation, 404 for missing work orders, DIY work orders, empty notes/expenses, photo count, vendor contact mapping, address formatting, filename sanitization

Test plan

• 9 new unit tests passing
• 913 total Application.Tests passing (0 regressions)
• Solution builds with 0 errors
• Manual smoke test: call endpoint with valid work order ID, verify PDF opens and contains all sections
• Verify 404 returned for non-existent work order ID

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