系统设置增加中控企业微信告警，后台巡检离线/故障并冷却推送。

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

static/hub.css

@@ -399,8 +399,44 @@ button, .btn {
   box-shadow: var(--shadow);
 }
 .empty { padding: 40px; color: var(--muted); }
+.settings-grid {
+  display: grid;
+  grid-template-columns: repeat(auto-fit, minmax(320px, 480px));
+  gap: 20px;
+  align-items: start;
+}
 .settings-card { max-width: 480px; }
 .settings-form { max-width: 420px; }
+.settings-form .check-row {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  font-weight: 500;
+}
+.settings-form .check-row input { width: auto; margin: 0; }
+.settings-form .field-hint {
+  display: block;
+  margin-top: 4px;
+  font-size: 12px;
+  color: var(--muted);
+  font-weight: 400;
+}
+.settings-actions {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 10px;
+  margin-top: 4px;
+}
+.settings-actions .btn-secondary,
+button.btn-secondary {
+  background: transparent;
+  color: var(--text);
+  border: 1px solid var(--line);
+}
+.settings-actions .btn-secondary:hover,
+button.btn-secondary:hover {
+  border-color: var(--accent, #60a5fa);
+}
 input.readonly {
   opacity: 0.75;
   cursor: default;