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/Admin/AdminChannelsController.cs

@@ -14,7 +14,7 @@ using Microsoft.AspNetCore.Mvc;
 namespace HrynCo.NotificationService.Web.Controllers.Admin;
 
 [Route("admin/channels")]
-public class AdminChannelsController(IMediator mediator) : Controller
+public class AdminChannelsController(IMediator mediator, INotificationServiceRepository services) : Controller
 {
 
     // GET /admin/channels
@@ -33,10 +33,7 @@ public class AdminChannelsController(IMediator mediator) : Controller
 
     // GET /admin/channels/create
     [HttpGet("create")]
-    public IActionResult Create()
-    {
-        return View("Edit", new EmailChannelEditViewModel());
-    }
+    public Task<IActionResult> Create(CancellationToken ct) => EditorViewAsync(new EmailChannelEditViewModel(), ct);
 
     // GET /admin/channels/{id}
     [HttpGet("{id:guid}")]
@@ -55,7 +52,7 @@ public class AdminChannelsController(IMediator mediator) : Controller
         var vm = new EmailChannelEditViewModel
         {
             Id = channel.Id,
-            ServiceName = channel.ServiceName,
+            ServiceId = channel.ServiceId,
             Priority = channel.Priority,
             EmailChannelType = channel.EmailChannelType,
             DailyLimit = channel.DailyLimit,
@@ -70,7 +67,7 @@ public class AdminChannelsController(IMediator mediator) : Controller
             FromName = smtp.FromName
         };
 
-        return View(vm);
+        return await EditorViewAsync(vm, ct);
     }
 
     // POST /admin/channels/save
@@ -79,13 +76,13 @@ public class AdminChannelsController(IMediator mediator) : Controller
     public async Task<IActionResult> Save(EmailChannelEditViewModel model, CancellationToken ct)
     {
         if (!ModelState.IsValid)
-            return EditWithErrors(model);
+            return await EditorViewAsync(model, ct);
 
         var (password, passwordError) = await ResolvePasswordForSave(model, ct);
         if (passwordError is not null)
         {
             ModelState.AddModelError(nameof(model.Password), passwordError);
-            return EditWithErrors(model);
+            return await EditorViewAsync(model, ct);
         }
 
         var smtpSettings = new SmtpChannelSettings
@@ -102,7 +99,7 @@ public class AdminChannelsController(IMediator mediator) : Controller
         if (model.IsNew)
         {
             var command = new CreateEmailChannelCommand(
-                model.ServiceName,
+                model.ServiceId!.Value,
                 model.Priority,
                 EmailChannelType.Smtp,
                 smtpSettings,
@@ -115,13 +112,14 @@ public class AdminChannelsController(IMediator mediator) : Controller
             if (!result.IsSuccess)
             {
                 ModelState.AddModelError("", result.Error?.Message ?? "Failed to create channel.");
-                return EditWithErrors(model);
+                return await EditorViewAsync(model, ct);
             }
         }
         else
         {
             var command = new UpdateEmailChannelCommand(
                 model.Id,
+                model.ServiceId!.Value,
                 model.Priority,
                 smtpSettings,
                 model.DailyLimit,
@@ -133,7 +131,7 @@ public class AdminChannelsController(IMediator mediator) : Controller
             if (!result.IsSuccess)
             {
                 ModelState.AddModelError("", result.Error?.Message ?? "Failed to update channel.");
-                return EditWithErrors(model);
+                return await EditorViewAsync(model, ct);
             }
         }
 
@@ -157,9 +155,12 @@ public class AdminChannelsController(IMediator mediator) : Controller
         return (saved.Password, null);
     }
 
-    private IActionResult EditWithErrors(EmailChannelEditViewModel model)
+    private async Task<IActionResult> EditorViewAsync(EmailChannelEditViewModel model, CancellationToken ct)
     {
         model.Password = null;
+        model.Services = (await services.GetAllAsync(ct))
+            .Select(service => new Microsoft.AspNetCore.Mvc.Rendering.SelectListItem(service.Name, service.Id.ToString()))
+            .ToList();
         return View("Edit", model);
     }
 
@@ -227,5 +228,3 @@ public class AdminChannelsController(IMediator mediator) : Controller
         return RedirectToAction(nameof(Index));
     }
 }
-
-public record TestChannelRequest(string ToEmail);