feat: DB-backed localized templates + language-aware emails

- New Apis/myai-models project: MyAiDbContext (schema myAi), TemplateEntity,
  ITemplateService, DbTemplateService with 10-min in-memory cache
- Seeds EN+RO variants for all user-facing templates (match email, job search
  results email, HTML status pages, AI system prompt)
- Match result email now sent in user's UI language (en/ro)
- Job search results email now respects session language
- Language propagates: MatchJobRequest -> token -> session -> email
- Add Language column to JobSearchTokens and JobSearchSessions (default 'en')
- All three Dockerfiles updated to include myai-models in build context

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

Jobs/cv-search-job/Program.cs

@@ -9,6 +9,8 @@ using JobScheduler.Tasks;
 using Microsoft.EntityFrameworkCore;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Hosting;
+using MyAi.Models.Data;
+using MyAi.Models.Services;
 using Refit;
 using Serilog;
 using Shared.Models.Settings;
@@ -51,6 +53,17 @@ try
                 client.DefaultRequestHeaders.Add("X-Internal-Api-Key", key);
         });
 
+    builder.Services.AddDbContext<MyAiDbContext>(options =>
+    {
+        var connectionString = builder.Services.GetConfiguredDbConnectionString(builder.Configuration);
+        options.UseSqlServer(connectionString, sql =>
+        {
+            sql.MigrationsAssembly("myai-models");
+            sql.MigrationsHistoryTable(MyAiDbContext.MigrationTableName, MyAiDbContext.SchemaName);
+        });
+    });
+    builder.Services.AddSingleton<ITemplateService, DbTemplateService>();
+
     builder.Services.AddHttpClient<HtmlJobSearcher>();
     builder.Services.AddSingleton<CvSearchEmailSender>();
 
@@ -66,12 +79,17 @@ try
 
     host.LogHostStartupDiagnostics(ServiceName);
 
-    Log.Information("Running EF Core migrations for CvSearchDbContext");
+    Log.Information("Running EF Core migrations");
     using (var scope = host.Services.CreateScope())
     {
         var db = scope.ServiceProvider.GetRequiredService<CvSearchDbContext>();
         db.Database.Migrate();
     }
+    using (var scope = host.Services.CreateScope())
+    {
+        var db = scope.ServiceProvider.GetRequiredService<MyAiDbContext>();
+        db.Database.Migrate();
+    }
 
     Log.Information("{Service} startup complete. Background scheduler is running.", ServiceName);
     await host.RunAsync();