Add configurable TIMEZONE for web UI display (UTC storage preserved)

server/templates/admin_settings.html

@@ -31,6 +31,15 @@
                 <label class="form-label">NOTIFICATION_TELEGRAM_CHAT_ID</label>
                 <input type="text" class="form-control" id="NOTIFICATION_TELEGRAM_CHAT_ID" value="{{ settings.NOTIFICATION_TELEGRAM_CHAT_ID or '' }}">
             </div>
+            <div class="mb-3">
+                <label class="form-label">Часовой пояс</label>
+                <select class="form-select" id="TIMEZONE">
+                    {% for tz in timezones %}
+                    <option value="{{ tz }}" {% if settings.TIMEZONE == tz %}selected{% endif %}>{{ tz }}</option>
+                    {% endfor %}
+                </select>
+                <div class="form-text">UTC хранится как есть, в веб-интерфейсе время отображается в выбранном поясе.</div>
+            </div>
             <button type="submit" class="btn btn-primary">Сохранить</button>
         </form>
         <div id="settings-error" class="alert alert-danger mt-3 d-none"></div>
@@ -51,6 +60,7 @@ document.getElementById('settings-form').addEventListener('submit', async (e) =>
         NOTIFICATION_WEBHOOK_URL: document.getElementById('NOTIFICATION_WEBHOOK_URL').value,
         NOTIFICATION_TELEGRAM_BOT_TOKEN: document.getElementById('NOTIFICATION_TELEGRAM_BOT_TOKEN').value,
         NOTIFICATION_TELEGRAM_CHAT_ID: document.getElementById('NOTIFICATION_TELEGRAM_CHAT_ID').value,
+        TIMEZONE: document.getElementById('TIMEZONE').value,
     };
     const res = await fetch('/api/settings', {
         method: 'POST',