38dcfdfa6d
- Prisma model SearchProvider with userId/tenantId scoping
- Three default providers (Google/Bing/DuckDuckGo) as constants, always returned without DB seed
- GET/POST/DELETE search-providers endpoints on DashboardController
- Ownership verification on delete (T-05-07), default providers cannot be deleted
- CreateSearchProviderDto with class-validator: urlTemplate must contain {query} (T-05-08)
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>