Add boat service mode with configurable service type

[sinamics]

Adds a workshop.serviceType setting (Automotive / Boat Service) that dynamically changes field labels throughout the app:

• Make → Manufacturer, Mileage → Engine Hours, Transmission → Engine Type (outboard/inboard), Engine Size → Engine, VIN → HIN, License Plate → Registration Number
• Applies to vehicle forms, list views, detail pages, service records, inspections, PDFs, shared links, and customer portal
• Uses React context (ServiceTypeProvider) for authenticated pages, direct DB fetch for public/PDF routes
• Setting accessible in Settings → Company (dropdown, defaults to Automotive)
• Translations for all 11 locales