v1.2.9: Phase 1 — sidebar + views layout

index.html: full rewrite
- Sidebar (192px/72px, blue top border): Верстак/Обзор/История/Сценарии/Логи
- Views: workbench (service left rail + instances/params right), overview, history, scenarios, logs
- Token form moved to sidebar bottom
- All existing DOM ids preserved: inst-list, params-area, params-form, btn-test,
  test-status, create-btn-area, history-card, history-body, scenario-card, scenario-body
- Log panel adjusted: left 72px (sidebar width)
- Fonts increased: 12-14px

views.js (NEW): switchView(id) — show/hide views, auto-load content on open

site/static/js/views.js

@@ -0,0 +1,22 @@
+// views.js — переключение видов (sidebar navigation)
+
+function switchView(viewId) {
+    document.querySelectorAll('.view').forEach(v => v.classList.add('hidden'));
+    const target = document.getElementById('view-' + viewId);
+    if (target) target.classList.remove('hidden');
+    // Подсветка активного пункта
+    document.querySelectorAll('.sidebar-item').forEach(el => el.classList.remove('active'));
+    const btn = document.querySelector('.sidebar-item[data-view="' + viewId + '"]');
+    if (btn) btn.classList.add('active');
+    // Автозагрузка при открытии вида
+    if (viewId === 'history-view' && typeof toggleHistory === 'function') {
+        if (!historyOpen) toggleHistory();
+    }
+    if (viewId === 'scenarios-view' && typeof toggleScenario === 'function') {
+        if (!scenarioOpen) toggleScenario();
+    }
+    if (viewId === 'logs-view' && typeof toggleLog === 'function') {
+        const lp = document.getElementById('log-panel');
+        if (lp && lp.style.display === 'none') toggleLog();
+    }
+}