Implement Node.js backend rewrite with SQLite authentication, admin dashboard and One-Click docker update

assets/js/admin.js

@@ -0,0 +1,104 @@
+$(document).ready(function() {
+    // Check if admin
+    $.get('/api/auth/me')
+        .done(function(user) {
+            console.log("Logged in:", user);
+            if(user.role !== 'admin') {
+                alert("Kein Zugriff!");
+                window.location.href = '/';
+            } else {
+                loadUsers();
+                loadAssignmentImages();
+                $('body').removeClass('is-preload');
+            }
+        })
+        .fail(function() {
+            window.location.href = '/';
+        });
+
+    $('#logout-btn').click(function(e) {
+        e.preventDefault();
+        $.post('/api/auth/logout').done(function() { window.location.href = '/'; });
+    });
+
+    function loadUsers() {
+        $.get('/api/admin/users').done(function(users) {
+            $('#users-tbody').empty();
+            $('#user-select').html('<option value="">Nutzer wählen...</option>');
+            users.forEach(u => {
+                $('#users-tbody').append(`
+                    <tr>
+                        <td>${u.id}</td>
+                        <td>${u.username} ${u.role==='admin'?'(Admin)':''}</td>
+                        <td>${u.id !== 1 ? `<button onclick="deleteUser(${u.id})">Löschen</button>` : ''}</td>
+                    </tr>
+                `);
+                if(u.role !== 'admin') {
+                    $('#user-select').append(`<option value="${u.id}">${u.username}</option>`);
+                }
+            });
+        });
+    }
+
+    window.deleteUser = function(id) {
+        if(confirm("Nutzer löschen?")) {
+            $.ajax({url: '/api/admin/users/'+id, type: 'DELETE'}).done(loadUsers);
+        }
+    };
+
+    $('#create-user-form').submit(function(e) {
+        e.preventDefault();
+        $.post('/api/admin/users', { username: $('#new-username').val(), password: $('#new-password').val(), role: 'user' })
+         .done(function() {
+             $('#new-username').val('');
+             $('#new-password').val('');
+             loadUsers();
+         }).fail(function(err) { alert("Fehler: " + err.responseJSON.error); });
+    });
+
+    let allImages = [];
+    function loadAssignmentImages() {
+        $.get('/images/fulls/').done(function(files) {
+            allImages = files;
+            $('#image-checkboxes').empty();
+            files.forEach(f => {
+                $('#image-checkboxes').append(`
+                    <label class="img-check">
+                        <img src="/images/thumbs/${encodeURIComponent(f.name)}" />
+                        <br/><input type="checkbox" value="${f.name}" class="img-cb"/> 
+                    </label>
+                `);
+            });
+        });
+    }
+
+    $('#user-select').change(function() {
+        const uid = $(this).val();
+        $('.img-cb').prop('checked', false);
+        if(!uid) return;
+        $.get('/api/admin/assign').done(function(assignments) {
+            assignments.filter(a => a.user_id == uid).forEach(a => {
+                $(`.img-cb[value="${a.image_name}"]`).prop('checked', true);
+            });
+        });
+    });
+
+    $('#save-assignments').click(function() {
+        const uid = $('#user-select').val();
+        if(!uid) return alert('Bitte Nutzer wählen');
+        const selected = [];
+        $('.img-cb:checked').each(function() { selected.push($(this).val()); });
+        
+        $.post('/api/admin/assign', { user_id: uid, image_names: selected })
+         .done(function() { alert("Zuweisung gespeichert!"); });
+    });
+
+    $('#update-btn').click(function() {
+        if(!confirm("Achtung: Dies startet den Server neu. Fortfahren?")) return;
+        $('#update-status').text('Update läuft...');
+        $.post('/api/admin/update').done(function(res) {
+            $('#update-status').text(res.message);
+            setTimeout(() => { window.location.reload(); }, 5000);
+        });
+    });
+});