fix(ai): meter synchronous generations

JobTrackerApi/Program.cs

@@ -39,6 +39,7 @@ builder.Services.AddHttpContextAccessor();
 builder.Services.AddSingleton(externalOrigin);
 builder.Services.AddSingleton<AiPrivacyPolicy>();
 builder.Services.AddSingleton<AiOperationExecutionScope>();
+builder.Services.AddSingleton<AiUsageExecutionScope>();
 builder.Services.AddTransient<AiPrivacyHeaderHandler>();
 builder.Services.AddScoped<CurrentUserService>();
 builder.Services.AddScoped<ICurrentUserService>(sp => sp.GetRequiredService<CurrentUserService>());
@@ -149,6 +150,7 @@ builder.Services.AddProblemDetails(options =>
     options.CustomizeProblemDetails = context =>
         context.ProblemDetails.Extensions["traceId"] = context.HttpContext.TraceIdentifier;
 });
+builder.Services.AddExceptionHandler<AiUsageLimitExceptionHandler>();
 builder.Services.AddOpenApi();
 var dataRoot = (builder.Configuration["Data:Root"] ?? "").Trim();
 if (string.IsNullOrWhiteSpace(dataRoot))
@@ -203,7 +205,8 @@ builder.Services.AddHttpClient("ai-service", client =>
 
 builder.Services.AddMemoryCache();
 builder.Services.AddScoped<AnalyticsService>();
-builder.Services.AddSingleton<ISummarizerService, SummarizerService>();
+builder.Services.AddSingleton<SummarizerService>();
+builder.Services.AddScoped<ISummarizerService, MeteredSummarizerService>();
 builder.Services.AddSingleton<IJobCvMatchService, JobCvMatchService>();
 builder.Services.AddSingleton<ICvAiClassifier, CvAiClassifier>();
 builder.Services.AddSingleton<ICvAiNormalizer, CvAiNormalizer>();