feat(push): add service-owned firebase channels and delivery

Add push contracts, provider delivery and channel diagnostics. Link email channels to services and document migration and validation.

Ref: IT-1074

HrynCo.NotificationService.Web/Controllers/Api/EmailChannels/CreateEmailChannelRequest.cs

@@ -1,10 +1,9 @@
-using System.ComponentModel.DataAnnotations;
 using HrynCo.NotificationService.DAL.Abstract.Providers;
 
 namespace HrynCo.NotificationService.Web.Controllers.Api.EmailChannels;
 
 public sealed record CreateEmailChannelRequest(
-    [Required, StringLength(100)] string ServiceName,
+    Guid ServiceId,
     int Priority,
     EmailChannelType ChannelType,
     SmtpChannelSettingsDto Settings,

HrynCo.NotificationService.Web/Controllers/Api/EmailChannels/EmailChannelDto.cs

@@ -2,6 +2,6 @@ using HrynCo.NotificationService.DAL.Abstract.Providers;
 
 namespace HrynCo.NotificationService.Web.Controllers.Api.EmailChannels;
 
-public sealed record EmailChannelDto(Guid Id, string ServiceName, int Priority, EmailChannelType EmailChannelType,
+public sealed record EmailChannelDto(Guid Id, Guid ServiceId, string ServiceName, int Priority, EmailChannelType EmailChannelType,
     SmtpChannelSettingsDto Settings, int? DailyLimit, int? MonthlyLimit, int WarnThresholdPercent,
     bool IsActive, DateTimeOffset Created, DateTimeOffset? Updated);

HrynCo.NotificationService.Web/Controllers/Api/EmailChannels/EmailChannelMapping.cs

@@ -13,7 +13,7 @@ internal static class EmailChannelMapping
     public static EmailChannelDto Map(EmailChannel channel)
     {
         var smtp = (SmtpChannelSettings)channel.Settings;
-        return new EmailChannelDto(channel.Id, channel.ServiceName, channel.Priority, channel.EmailChannelType,
+        return new EmailChannelDto(channel.Id, channel.ServiceId, channel.ServiceName, channel.Priority, channel.EmailChannelType,
             new SmtpChannelSettingsDto
             {
                 Host = smtp.Host, Port = smtp.Port, Username = smtp.Username, Password = smtp.Password,

HrynCo.NotificationService.Web/Controllers/Api/EmailChannels/EmailChannelsController.cs

@@ -48,7 +48,7 @@ public sealed class EmailChannelsController : ApiControllerBase
         if (request.ChannelType != EmailChannelType.Smtp)
             return MapServiceError(new ServiceError("Only SMTP channels are supported.", ServiceErrorCode.InvalidRequest));
         var command = new CreateEmailChannelCommand(
-            request.ServiceName,
+            request.ServiceId,
             request.Priority,
             request.ChannelType,
             EmailChannelMapping.ToSettings(request.Settings),
@@ -72,6 +72,7 @@ public sealed class EmailChannelsController : ApiControllerBase
     {
         var command = new UpdateEmailChannelCommand(
             id,
+            request.ServiceId,
             request.Priority,
             EmailChannelMapping.ToSettings(request.Settings),
             request.DailyLimit,

HrynCo.NotificationService.Web/Controllers/Api/EmailChannels/UpdateEmailChannelRequest.cs

@@ -3,6 +3,7 @@ using HrynCo.NotificationService.DAL.Abstract.Providers;
 namespace HrynCo.NotificationService.Web.Controllers.Api.EmailChannels;
 
 public sealed record UpdateEmailChannelRequest(
+    Guid ServiceId,
     int Priority,
     SmtpChannelSettingsDto Settings,
     int? DailyLimit,