Rename EmailApi.Models.* namespace to Email.Models.* in email-api-models

Removes the spurious Api segment to match the pattern used by all other
models projects: CvMatcher.Models.*, Rag.Models.*, PageFetcher.Models.*.

Updated all consumers: email-api, api, cv-search-job.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Jobs/cv-search-job/Program.cs

@@ -7,7 +7,7 @@ using Email.Data;
 using Email.Data.Repositories;
 using Email.Data.Repositories.Contracts;
 using Email.Data.Services;
-using EmailApi.Models.Clients;
+using Email.Models.Clients;
 using CvSearchJob.Tasks;
 using JobScheduler.Scheduling;
 using JobScheduler.Tasks;