feat: add email-api-data project with EmailTemplates repository and service

New data project owning the emailApi schema:
- EmailTemplateEntity with Key, Language, Value, Description, UpdatedAt, OperatorCopy
- EmailApiDbContext (schema: emailApi, custom migration table _EmailApiMigrations)
- IEmailTemplateRepository / EfEmailTemplateRepository (scoped)
- IEmailTemplateService / EmailTemplateService (singleton, 10-min cache)
  - GetOperatorCopy falls back to first non-empty OperatorCopy across all rows
- Initial migration CreateEmailTemplates: creates table + seeds all email.*
  templates (match + search-results in en/ro) and html-shell fragments
  with OperatorCopy = "contact@myai.ro" for addressable rows

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

Apis/email-api-data/Repositories/Contracts/IEmailTemplateRepository.cs

@@ -0,0 +1,8 @@
+using EmailApi.Data.Entities;
+
+namespace EmailApi.Data.Repositories.Contracts;
+
+public interface IEmailTemplateRepository
+{
+    Task<IReadOnlyList<EmailTemplateEntity>> GetAllAsync(CancellationToken ct);
+}

Apis/email-api-data/Repositories/EfEmailTemplateRepository.cs

@@ -0,0 +1,18 @@
+using EmailApi.Data.Entities;
+using EmailApi.Data.Repositories.Contracts;
+using Microsoft.EntityFrameworkCore;
+
+namespace EmailApi.Data.Repositories;
+
+public sealed class EfEmailTemplateRepository : IEmailTemplateRepository
+{
+    private readonly EmailApiDbContext _db;
+
+    public EfEmailTemplateRepository(EmailApiDbContext db)
+    {
+        _db = db;
+    }
+
+    public async Task<IReadOnlyList<EmailTemplateEntity>> GetAllAsync(CancellationToken ct)
+        => await _db.EmailTemplates.AsNoTracking().ToListAsync(ct);
+}