feat: декомпозиция JS на модули (auth, tasks, chat, app) и добавление гостевого режима с локальной нейросетью

static/js/auth.js

@@ -0,0 +1,72 @@
+function showAuthModal() {
+    document.getElementById('auth-modal').classList.remove('hidden');
+}
+
+function hideAuthModal() {
+    document.getElementById('auth-modal').classList.add('hidden');
+}
+
+async function verifyToken(token) {
+    try {
+        const res = await fetch('/api/v1/tasks', {
+            headers: { 'Authorization': `Bearer ${token}` }
+        });
+        return res.status === 200;
+    } catch (err) {
+        return false;
+    }
+}
+
+async function handleLogin(e) {
+    e.preventDefault();
+    const tokenInput = document.getElementById('auth-token-input');
+    const errorEl = document.getElementById('auth-error');
+    const token = tokenInput.value.trim();
+
+    if (!token) return;
+
+    errorEl.classList.add('hidden');
+    const isValid = await verifyToken(token);
+
+    if (isValid) {
+        API_TOKEN = token;
+        IS_GUEST = false;
+        localStorage.setItem(AUTH_TOKEN_KEY, token);
+        localStorage.removeItem('scud_is_guest');
+        hideAuthModal();
+        updateUIState();
+        loadTasks();
+    } else {
+        errorEl.classList.remove('hidden');
+    }
+}
+
+function enableGuestMode() {
+    IS_GUEST = true;
+    API_TOKEN = "";
+    localStorage.setItem('scud_is_guest', 'true');
+    hideAuthModal();
+    updateUIState();
+}
+
+function logout() {
+    localStorage.removeItem(AUTH_TOKEN_KEY);
+    localStorage.removeItem('scud_is_guest');
+    API_TOKEN = "";
+    IS_GUEST = false;
+    document.getElementById('auth-token-input').value = "";
+    showAuthModal();
+}
+
+function updateUIState() {
+    const tasksBtn = document.getElementById('tasks-drawer-btn');
+    const guestBadge = document.getElementById('guest-badge');
+    
+    if (IS_GUEST) {
+        if (tasksBtn) tasksBtn.classList.add('hidden');
+        if (guestBadge) guestBadge.classList.remove('hidden');
+    } else {
+        if (tasksBtn) tasksBtn.classList.remove('hidden');
+        if (guestBadge) guestBadge.classList.add('hidden');
+    }
+}