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>

Apis/api/Program.cs

@@ -1,9 +1,13 @@
 using System.Reflection;
 using Api.Services;
 using Api.Services.Contracts;
+using Microsoft.EntityFrameworkCore;
 using Models.Settings;
+using MyAi.Models.Data;
+using MyAi.Models.Services;
 using Refit;
 using Serilog;
+using Shared.Models.Settings;
 using StartupHelpers;
 
 StartupExtensions.LoadDotEnvFile();
@@ -30,6 +34,17 @@ try
     builder.Services.Configure<FileStorageSettings>(builder.Configuration.GetSection("FileStorage"));
     builder.Services.Configure<JobSearchLinkSettings>(builder.Configuration.GetSection("JobSearch"));
 
+    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<ICaptchaVerifier, RecaptchaVerifier>();
     builder.Services.AddSingleton<IEmailSender, SmtpEmailSender>();
     builder.Services.AddSingleton<Microsoft.AspNetCore.StaticFiles.IContentTypeProvider, Microsoft.AspNetCore.StaticFiles.FileExtensionContentTypeProvider>();
@@ -71,6 +86,13 @@ try
     app.UseRateLimiter();
     app.MapControllers();
 
+    Log.Information("Running EF Core migrations if any");
+    using (var scope = app.Services.CreateScope())
+    {
+        var db = scope.ServiceProvider.GetRequiredService<MyAiDbContext>();
+        db.Database.Migrate();
+    }
+
     Log.Information("{Service} startup complete. Listening for requests...", ServiceName);
     app.Run();
 }