feat(cv-matcher): add AiPrompts table; remove MyAiDbContext dependency

cv-matcher-data:
- Add AiPromptEntity (Key, Language, Value, Description, UpdatedAt)
- Add AiPrompts DbSet to CvMatcherDbContext with composite PK
- Migration AddAiPrompts: create cvMatcher.AiPrompts table and seed
  ai.cv-match.system-prompt (language "*") with the current prompt value

cv-matcher-api:
- Add IAiPromptsRepository / EfAiPromptsRepository under Data/Repositories/
- CvMatcherService: inject IAiPromptsRepository; replace _templates.Render(...)
  with async DB lookup + simple string replacement
- Program.cs: register IAiPromptsRepository (scoped); remove MyAiDbContext,
  ITemplateService/DbTemplateService registrations and MyAiDbContext migration call
- Remove myai-data ProjectReference

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

Apis/cv-matcher-api/Program.cs

@@ -10,8 +10,6 @@ using Api.Services.Contracts;
 using CvMatcher.Models.Settings;
 using CvSearch.Data;
 using Microsoft.EntityFrameworkCore;
-using MyAi.Data;
-using MyAi.Data.Services;
 using Refit;
 using Serilog;
 using Common.Settings;
@@ -76,18 +74,8 @@ try
         });
     });
 
-    builder.Services.AddDbContext<MyAiDbContext>(options =>
-    {
-        var connectionString = builder.Services.GetConfiguredDbConnectionString(builder.Configuration);
-        options.UseSqlServer(connectionString, sql =>
-        {
-            sql.MigrationsAssembly("myai-data");
-            sql.MigrationsHistoryTable(MyAiDbContext.MigrationTableName, MyAiDbContext.SchemaName);
-        });
-    });
-    builder.Services.AddSingleton<ITemplateService, DbTemplateService>();
-
     builder.Services.AddScoped<IMatcherRepository, EfMatcherRepository>();
+    builder.Services.AddScoped<IAiPromptsRepository, EfAiPromptsRepository>();
     builder.Services.AddScoped<ICvMatcherService, CvMatcherService>();
     builder.Services.AddScoped<IJobTokenService, JobTokenService>();
 
@@ -122,11 +110,6 @@ 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();