Add hub system logs page with PM2 stdout/stderr tabs for all exchanges.

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

manual_trading_hub/static/app.css

@@ -8321,3 +8321,101 @@ html[data-theme="light"] .hub-options-summary strong {
   color: #142232;
 }
 
+/* ── 系统日志页 ── */
+.hub-logs-page-head {
+  display: flex;
+  align-items: flex-start;
+  justify-content: space-between;
+  gap: 12px;
+  flex-wrap: wrap;
+}
+.hub-logs-page-actions {
+  display: flex;
+  gap: 8px;
+  flex-wrap: wrap;
+}
+.hub-logs-toolbar {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 12px;
+  flex-wrap: wrap;
+  margin-bottom: 12px;
+}
+.hub-logs-tabs {
+  display: flex;
+  gap: 8px;
+  flex-wrap: wrap;
+}
+.hub-logs-tab {
+  padding: 6px 14px;
+  border-radius: 999px;
+  border: 1px solid var(--border-soft);
+  background: var(--surface-2);
+  color: var(--text-soft);
+  cursor: pointer;
+  font-size: 0.88rem;
+}
+.hub-logs-tab.is-active {
+  background: var(--accent-soft);
+  border-color: var(--accent);
+  color: var(--text);
+}
+#hub-logs-status.is-err {
+  color: var(--danger, #f87171);
+}
+.hub-logs-layout {
+  display: grid;
+  grid-template-columns: repeat(2, minmax(0, 1fr));
+  gap: 16px;
+  align-items: stretch;
+}
+.hub-logs-card {
+  display: flex;
+  flex-direction: column;
+  min-width: 0;
+  min-height: 420px;
+  max-height: calc(100vh - 220px);
+  padding: 16px 18px 18px;
+}
+.hub-logs-card-head {
+  display: flex;
+  align-items: baseline;
+  justify-content: space-between;
+  gap: 10px;
+  margin-bottom: 10px;
+}
+.hub-logs-card-title {
+  margin: 0;
+  font-size: 0.95rem;
+}
+.hub-logs-card-hint {
+  font-size: 0.72rem;
+  color: var(--muted, #8892b0);
+}
+.hub-logs-pre {
+  flex: 1 1 auto;
+  min-height: 0;
+  overflow: auto;
+  margin: 0;
+  padding: 12px;
+  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
+  font-size: 0.74rem;
+  line-height: 1.45;
+  white-space: pre-wrap;
+  word-break: break-word;
+  background: var(--inset-surface, #0d1018);
+  border-radius: 8px;
+  border: 1px solid var(--border-soft);
+  color: #d8deef;
+}
+@media (max-width: 960px) {
+  .hub-logs-layout {
+    grid-template-columns: minmax(0, 1fr);
+  }
+  .hub-logs-card {
+    max-height: none;
+    min-height: 280px;
+  }
+}
+