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/cv-matcher-api/Program.cs

@@ -11,6 +11,8 @@ using CvMatcher.Models.Settings;
 using CvSearch.Models.Data;
 using CvSearch.Models.Settings;
 using Microsoft.EntityFrameworkCore;
+using MyAi.Models.Data;
+using MyAi.Models.Services;
 using Refit;
 using Serilog;
 using Shared.Models.Settings;
@@ -74,6 +76,17 @@ try
         });
     });
 
+    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.AddScoped<IMatcherRepository, EfMatcherRepository>();
     builder.Services.AddScoped<ICvMatcherService, CvMatcherService>();
     builder.Services.AddScoped<IJobTokenService, JobTokenService>();
@@ -109,6 +122,11 @@ try
         var db = scope.ServiceProvider.GetRequiredService<CvSearchDbContext>();
         db.Database.Migrate();
     }
+    using (var scope = app.Services.CreateScope())
+    {
+        var db = scope.ServiceProvider.GetRequiredService<MyAiDbContext>();
+        db.Database.Migrate();
+    }
 
     Log.Information("{Service} startup complete", ServiceName);
     app.Run();