feat(halloffame): implement image upload and enhance module functionality

- Added image upload system (JPG/PNG, max 5MB) with live preview and removal option
- Fixed Concurrency Exception during deletion (split transactions for reports and entries)
- Optimized card layout: consistent height and height-based truncation for descriptions
- Added sort direction toggle (Ascending/Descending) with arrow icons for Date, Name, and Year
- Refactored HallOfFameService to use streams for Server/Wasm compatibility
- Improved error handling and UI feedback for upload and delete operations

Client/Modules/SZUAbsolventenverein.Module.HallOfFame/Edit.razor

@@ -1,6 +1,7 @@
 @using Oqtane.Modules.Controls
 @using SZUAbsolventenverein.Module.HallOfFame.Services
 @using SZUAbsolventenverein.Module.HallOfFame.Models
+@using Microsoft.AspNetCore.Components.Forms
 
 @namespace SZUAbsolventenverein.Module.HallOfFame
 @inherits ModuleBase
@@ -20,21 +21,47 @@
         <div class="row mb-3 align-items-center">
             <Label Class="col-sm-3 col-form-label" For="year" HelpText="Jahrgang (z.B. 2020)" ResourceKey="Year">Jahrgang: </Label>
             <div class="col-sm-9">
-                <input id="year" type="number" class="form-control" @bind="@_year" required min="1990" max="2100" />
+                <input id="year" type="number" class="form-control" @bind="@_year" required min="1900" max="@Int32.MaxValue" />
                 <div class="invalid-feedback">Bitte gib einen gültigen Jahrgang ein.</div>
             </div>
         </div>
         <div class="row mb-3 align-items-center">
             <Label Class="col-sm-3 col-form-label" For="description" HelpText="Kurzbeschreibung / Werdegang" ResourceKey="Description">Beschreibung: </Label>
             <div class="col-sm-9">
-                <textarea id="description" class="form-control" @bind="@_description" required rows="5" maxlength="1500"></textarea>
+                <textarea id="description" class="form-control" @bind="@_description" required rows="5" maxlength="500"></textarea>
+                <div class="text-muted small">@(_description?.Length ?? 0) / 500 Zeichen</div>
                  <div class="invalid-feedback">Bitte gib eine Beschreibung ein.</div>
             </div>
         </div>
-         <div class="row mb-3 align-items-center">
-            <Label Class="col-sm-3 col-form-label" For="image" HelpText="Bild URL (optional)" ResourceKey="Image">Bild URL: </Label>
+         <div class="row mb-3">
+            <Label Class="col-sm-3 col-form-label" For="image" HelpText="Porträtfoto hochladen (JPG/PNG)" ResourceKey="Image">Foto: </Label>
             <div class="col-sm-9">
-                <input id="image" class="form-control" @bind="@_image" />
+                <div class="mb-2">
+                    @if (!string.IsNullOrEmpty(_image))
+                    {
+                        <div class="position-relative d-inline-block">
+                            <img src="@_image" style="max-height: 150px; border-radius: 8px; margin-bottom: 10px; border: 1px solid #ddd;" alt="Vorschau" />
+                            <button type="button" class="btn btn-sm btn-danger" style="position: absolute; top: 5px; right: 5px;" @onclick="RemoveImage" title="Bild entfernen">
+                                <i class="oi oi-x"></i>
+                            </button>
+                        </div>
+                    }
+                    else
+                    {
+                        <div class="bg-light d-flex align-items-center justify-content-center text-muted" style="height: 150px; width: 150px; border: 2px dashed #ddd; border-radius: 8px;">
+                            Kein Bild
+                        </div>
+                    }
+                </div>
+                <InputFile OnChange="HandleFileSelected" class="form-control" accept=".jpg,.jpeg,.png" />
+                <div class="text-muted small mt-1">Nur JPG oder PNG, max. 5 MB.</div>
+                @if (_uploading)
+                {
+                    <div class="spinner-border spinner-border-sm text-primary mt-2" role="status">
+                        <span class="visually-hidden">Wird hochgeladen...</span>
+                    </div>
+                    <span class="small text-primary ms-1">Wird hochgeladen...</span>
+                }
             </div>
         </div>
         <div class="row mb-3 align-items-center">
@@ -53,8 +80,8 @@
     </div>
     
     <div class="mt-4">
-        <button type="button" class="btn btn-secondary me-2" @onclick="@(() => Save("Draft"))">Als Entwurf speichern</button>
-        <button type="button" class="btn btn-primary" @onclick="@(() => Save("Published"))">Veröffentlichen</button>
+        <button type="button" class="btn btn-secondary me-2" @onclick="@(() => Save("Draft"))" disabled="@_uploading">Als Entwurf speichern</button>
+        <button type="button" class="btn btn-primary" @onclick="@(() => Save("Published"))" disabled="@_uploading">Veröffentlichen</button>
         <NavLink class="btn btn-link ms-2" href="@NavigateUrl()">Abbrechen</NavLink>
     </div>
 
@@ -79,6 +106,7 @@
 
     private ElementReference form;
     private bool validated = false;
+    private bool _uploading = false;
 
     private int _id;
     private string _name;
@@ -102,7 +130,6 @@
                 _id = Int32.Parse(PageState.QueryString["id"]);
                 HallOfFame HallOfFame = await HallOfFameService.GetHallOfFameAsync(_id, ModuleState.ModuleId);
                 
-                // Security check: only allow editing own entry
                 if (HallOfFame != null)
                 {
                      if (HallOfFame.UserId != PageState.User.UserId)
@@ -126,11 +153,9 @@
             }
             else // Add Mode
             {
-                // Check if user already has an entry to prevent duplicates
                  var existing = await HallOfFameService.GetHallOfFameByUserIdAsync(PageState.User.UserId, ModuleState.ModuleId);
                  if (existing != null)
                  {
-                     // Use NavigateUrl with parameters properly (simplified here)
                       NavigationManager.NavigateTo(EditUrl(existing.HallOfFameId.ToString()));
                  }
             }
@@ -142,6 +167,50 @@
         }
     }
 
+    private async Task HandleFileSelected(InputFileChangeEventArgs e)
+    {
+        var file = e.File;
+        if (file == null) return;
+
+        if (file.Size > 5 * 1024 * 1024)
+        {
+            AddModuleMessage("Die Datei ist zu groß (max. 5 MB allowed).", MessageType.Warning);
+            return;
+        }
+
+        try
+        {
+            _uploading = true;
+            using var stream = file.OpenReadStream(5 * 1024 * 1024);
+            var url = await HallOfFameService.UploadFileAsync(stream, file.Name, ModuleState.ModuleId);
+            if (!string.IsNullOrEmpty(url))
+            {
+                _image = url;
+                AddModuleMessage("Foto erfolgreich hochgeladen.", MessageType.Success);
+            }
+            else
+            {
+                AddModuleMessage("Fehler beim Hochladen des Fotos.", MessageType.Error);
+            }
+        }
+        catch (Exception ex)
+        {
+            await logger.LogError(ex, "Error Uploading File {Error}", ex.Message);
+            AddModuleMessage("Ein technischer Fehler ist beim Upload aufgetreten.", MessageType.Error);
+        }
+        finally
+        {
+            _uploading = false;
+            StateHasChanged();
+        }
+    }
+
+    private void RemoveImage()
+    {
+        _image = string.Empty;
+        StateHasChanged();
+    }
+
     private async Task Save(string status)
     {
         try
@@ -156,7 +225,7 @@
                 {
                     HallOfFame HallOfFame = new HallOfFame();
                     HallOfFame.ModuleId = ModuleState.ModuleId;
-                    HallOfFame.UserId = PageState.User.UserId; // Set Owner
+                    HallOfFame.UserId = PageState.User.UserId;
                     HallOfFame.Name = _name;
                     HallOfFame.Year = _year;
                     HallOfFame.Description = _description;
@@ -170,7 +239,6 @@
                 else
                 {
                     HallOfFame HallOfFame = await HallOfFameService.GetHallOfFameAsync(_id, ModuleState.ModuleId);
-                    // Ensure we don't overwrite with invalid user logic, though server checks too
                     if (HallOfFame.UserId == PageState.User.UserId) 
                     {
                         HallOfFame.Name = _name;