refactor: move REST API controllers into Controllers/Api subfolder

- Prepares Controllers/ for both Api/ and Admin/ groupings
- Namespaces updated accordingly

Ref: IT-628

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

HrynCo.NotificationService.Web/Controllers/Api/EmailTemplates/CreateEmailTemplateRequest.cs

@@ -0,0 +1,13 @@
+using HrynCo.NotificationService.DAL.Abstract.Templates;
+
+namespace HrynCo.NotificationService.Web.Controllers.Api.EmailTemplates;
+
+public sealed record CreateEmailTemplateRequest(
+    string ServiceName,
+    string Key,
+    string LanguageCode,
+    string Subject,
+    string HtmlBody,
+    string TextBody,
+    IReadOnlyList<EmailTemplateVariable> Variables
+);

HrynCo.NotificationService.Web/Controllers/Api/EmailTemplates/EmailTemplatesController.cs

@@ -0,0 +1,84 @@
+using HrynCo.NotificationService.Web.Infrastructure;
+using HrynCo.NotificationService.Services.EmailTemplates.Create;
+using HrynCo.NotificationService.Services.EmailTemplates.Delete;
+using HrynCo.NotificationService.Services.EmailTemplates.Get;
+using HrynCo.NotificationService.Services.EmailTemplates.GetByService;
+using HrynCo.NotificationService.Services.EmailTemplates.Update;
+using MediatR;
+using Microsoft.AspNetCore.Mvc;
+
+namespace HrynCo.NotificationService.Web.Controllers.Api.EmailTemplates;
+
+[Route("api/v1/email-templates")]
+public sealed class EmailTemplatesController : ApiControllerBase
+{
+    public EmailTemplatesController(IMediator mediator) : base(mediator) { }
+
+    [HttpGet]
+    public async Task<IActionResult> GetAll([FromQuery] string serviceName, CancellationToken cancellationToken)
+    {
+        var result = await Mediator.Send(new GetEmailTemplatesQuery(serviceName), cancellationToken);
+        return FromServiceResult(result);
+    }
+
+    [HttpGet("{serviceName}/{key}/{languageCode}")]
+    public async Task<IActionResult> Get(string serviceName, string key, string languageCode, CancellationToken cancellationToken)
+    {
+        var result = await Mediator.Send(new GetEmailTemplateQuery(serviceName, key, languageCode), cancellationToken);
+        return FromServiceResult(result);
+    }
+
+    [HttpPost]
+    public async Task<IActionResult> Create([FromBody] CreateEmailTemplateRequest request, CancellationToken cancellationToken)
+    {
+        var command = new CreateEmailTemplateCommand(
+            request.ServiceName,
+            request.Key,
+            request.LanguageCode,
+            request.Subject,
+            request.HtmlBody,
+            request.TextBody,
+            request.Variables
+        );
+
+        var result = await Mediator.Send(command, cancellationToken);
+
+        if (!result.IsSuccess)
+            return MapServiceError(result.Error!);
+
+        return CreatedAtAction(
+            nameof(Get),
+            new { serviceName = request.ServiceName, key = request.Key, languageCode = request.LanguageCode },
+            new ApiResponse<Guid> { Success = true, Data = result.Result }
+        );
+    }
+
+    [HttpPut("{serviceName}/{key}/{languageCode}")]
+    public async Task<IActionResult> Update(
+        string serviceName,
+        string key,
+        string languageCode,
+        [FromBody] UpdateEmailTemplateRequest request,
+        CancellationToken cancellationToken)
+    {
+        var command = new UpdateEmailTemplateCommand(
+            serviceName,
+            key,
+            languageCode,
+            request.Subject,
+            request.HtmlBody,
+            request.TextBody,
+            request.Variables
+        );
+
+        var result = await Mediator.Send(command, cancellationToken);
+        return FromServiceResult(result);
+    }
+
+    [HttpDelete("{serviceName}/{key}/{languageCode}")]
+    public async Task<IActionResult> Delete(string serviceName, string key, string languageCode, CancellationToken cancellationToken)
+    {
+        var result = await Mediator.Send(new DeleteEmailTemplateCommand(serviceName, key, languageCode), cancellationToken);
+        return FromServiceResult(result);
+    }
+}

HrynCo.NotificationService.Web/Controllers/Api/EmailTemplates/UpdateEmailTemplateRequest.cs

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+using HrynCo.NotificationService.DAL.Abstract.Templates;
+
+namespace HrynCo.NotificationService.Web.Controllers.Api.EmailTemplates;
+
+public sealed record UpdateEmailTemplateRequest(
+    string Subject,
+    string HtmlBody,
+    string TextBody,
+    IReadOnlyList<EmailTemplateVariable> Variables
+);