Enhance user plan management and update related endpoints

- Added new configuration options for user plans in `.env.example`, including `Plans__MaxCustomConfigCount` and `Plans__MinCustomConfigCount`.
- Introduced `MapPlanEndpoints` in `Program.cs` to handle plan-related API routes.
- Implemented `SetUserPlan` endpoint in `RoleEndpoints` to allow admins to assign plans to users.
- Removed deprecated role request approval endpoints from `AdminSupportEndpoints`.
- Updated `ITelegramNotifier` and related classes to reflect changes in role request handling and payment notifications.
- Refactored role management commands to remove `MaxConfigs` and focus on `MaxIpLimit` and billing settings.
- Enhanced billing request handling to accommodate plan changes instead of role changes.
- Updated various interfaces and command handlers to support new plan management features.

backend/src/PnvPanel.Infrastructure/DependencyInjection.cs

@@ -7,11 +7,13 @@ using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.IdentityModel.Tokens;
 using PnvPanel.Application.Common.Interfaces;
+using PnvPanel.Application.Plans;
 using PnvPanel.Infrastructure.Apps;
 using PnvPanel.Infrastructure.BackgroundJobs;
 using PnvPanel.Infrastructure.Identity;
 using PnvPanel.Infrastructure.Instructions;
 using PnvPanel.Infrastructure.Persistence;
+using PnvPanel.Infrastructure.Plans;
 using PnvPanel.Infrastructure.Pricing;
 using PnvPanel.Infrastructure.Security;
 using PnvPanel.Infrastructure.Storage;
@@ -68,6 +70,7 @@ public static class DependencyInjection
             configuration.GetSection(AdminSeedOptions.SectionName)
         );
         services.Configure<RolesOptions>(configuration.GetSection(RolesOptions.SectionName));
+        services.Configure<PlansOptions>(configuration.GetSection(PlansOptions.SectionName));
 
         var jwtOptions =
             configuration.GetSection(JwtOptions.SectionName).Get<JwtOptions>()
@@ -141,6 +144,7 @@ public static class DependencyInjection
         services.AddScoped<IClientAppCatalogSeeder, ClientAppCatalogSeeder>();
         services.AddScoped<IInstructionIntroSeeder, InstructionIntroSeeder>();
         services.AddScoped<IPricingSettingsSeeder, PricingSettingsSeeder>();
+        services.AddScoped<IPlanSeeder, PlanSeeder>();
         // Один и тот же экземпляр CurrentUser на scope — и как ICurrentUser (чтение), и как
         // ICurrentUserSetter (запись, только для Telegram-бота, см. TelegramBotHostedService).
         services.AddScoped<CurrentUser>();