Rename positions nav to order monitor and set as default landing page.

Remove stats recalculate button; login and home now open /positions without affecting refresh on other routes.

Co-authored-by: Cursor <cursoragent@cursor.com>

static/js/stats.js

@@ -145,29 +145,11 @@
 
     document.addEventListener('DOMContentLoaded', function () {
         var viewSel = document.getElementById('stats-view-select');
-        var refreshBtn = document.getElementById('stats-refresh-btn');
         if (viewSel) {
             viewSel.addEventListener('change', function () {
                 renderBreakdown(this.value);
             });
         }
-        if (refreshBtn) {
-            refreshBtn.addEventListener('click', function () {
-                var btn = this;
-                btn.disabled = true;
-                btn.textContent = '计算中…';
-                fetch('/api/stats/refresh', { method: 'POST' })
-                    .then(function (r) { return r.json(); })
-                    .then(applyData)
-                    .catch(function () {
-                        alert('重新计算失败');
-                    })
-                    .finally(function () {
-                        btn.disabled = false;
-                        btn.textContent = '重新计算';
-                    });
-            });
-        }
         loadStats();
     });
 })();