Add Blazor application layer with UI components and pages

- Service interfaces and DTO models
- Dashboard page with account overview
- Account detail page with year/entry management
- Reusable components: AccountCard, EntryTable, YearSelector
- Dialog components: Add/Edit Account, Entry, Transfer, Year
- Main layout and routing configuration

src/Duempelkas.App/Components/Accounts/EntryTable.razor

@@ -0,0 +1,31 @@
+<div class="table-responsive">
+    <table class="table table-hover table-sm align-middle">
+        <thead class="table-light">
+            <tr>
+                <th style="width: 100px;">LfdNr</th>
+                <th style="width: 120px;">Datum</th>
+                <th>Bezeichnung</th>
+                <th style="width: 140px;" class="text-end">Betrag</th>
+                <th style="width: 80px;"></th>
+            </tr>
+        </thead>
+        <tbody>
+            @foreach (var entry in Entries)
+            {
+                <EntryRow Entry="entry" OnDelete="OnDeleteEntry" OnRestore="OnRestoreEntry" OnEdit="OnEditEntry" />
+            }
+        </tbody>
+    </table>
+</div>
+
+@if (!Entries.Any())
+{
+    <div class="text-center py-3 text-muted">Keine Einträge vorhanden.</div>
+}
+
+@code {
+    [Parameter] public List<EntryDto> Entries { get; set; } = new();
+    [Parameter] public EventCallback<int> OnDeleteEntry { get; set; }
+    [Parameter] public EventCallback<int> OnRestoreEntry { get; set; }
+    [Parameter] public EventCallback<int> OnEditEntry { get; set; }
+}