Revert "Refactor PDF viewing and integrate DevExpress support"

This reverts commit b515b4f523.

DXApp.TemplateKitProject/Pages/Invoices/ViewPdf.cshtml.cs

@@ -1,40 +1,24 @@
-using Microsoft.AspNetCore.Mvc;
+using DXApp.TemplateKitProject.Data;
+using Microsoft.AspNetCore.Mvc;
 using Microsoft.AspNetCore.Mvc.RazorPages;
-using DXApp.TemplateKitProject.Data;
 using Microsoft.EntityFrameworkCore;
 
 namespace DXApp.TemplateKitProject.Pages.Invoices;
 
-public class ViewPdfModel : PageModel
+public class ViewPdfModel(AppDbContext db) : PageModel
 {
-    private readonly AppDbContext _db;
-    private readonly ILogger<ViewPdfModel> _logger;
-
-    public ViewPdfModel(AppDbContext db, ILogger<ViewPdfModel> logger)
-    {
-        _db = db;
-        _logger = logger;
-    }
-
     public async Task<IActionResult> OnGetAsync(int id)
     {
-        // Sicherheit: defensive checks, gleiche Logik wie CustomReportStorageWebExtension
-        var invoice = await _db.ZugferdInvoices
-            .AsNoTracking()
+        var invoice = await db.ZugferdInvoices
             .FirstOrDefaultAsync(i => i.Id == id);
 
-        if (invoice is null)
-            return NotFound();
-
-        if (string.IsNullOrEmpty(invoice.ResultFilePath))
+        if (invoice is null || string.IsNullOrEmpty(invoice.ResultFilePath))
             return NotFound();
 
         if (!System.IO.File.Exists(invoice.ResultFilePath))
             return NotFound();
 
         var bytes = await System.IO.File.ReadAllBytesAsync(invoice.ResultFilePath);
-        _logger.LogInformation("ViewPdf: Invoice {Id} ausgeliefert ({Size} Bytes).", id, bytes.Length);
-
-        return File(bytes, "application/pdf", $"{Path.GetFileName(invoice.ResultFilePath)}");
+        return File(bytes, "application/pdf");
     }
 }