fix: 社区点击自动跳转步骤4 + 边显示 + 区分节点样式

修复:
- loadClusterDetail: 无map时自动goStep(4)并等待初始化
- focusClusterOnMap: 边已正确添加到_clusterFocusLayer
- renderMapData: 集群聚焦时保留_clusterFocusLayer
- 节点样式按度数区分: 高流量(>20对端)大圆深色, 孤立节点小圆浅色
- 节点提示显示对端数和服务器标签
- clearClusterFocus简化,去除无用_clusterNodeLayer

Co-Authored-By: Claude <noreply@anthropic.com>

simple_analysis/templates/simple_analysis/simple_analysis.html

@@ -1432,10 +1432,19 @@ function renderMapData() {
         if (SA.hiddenClusters.has(n.cluster_id)) return;
 
         const color = getSubnetColor(n.ip);
-        // Larger circles, easy to click
+        const peerCount = n.peer_count || 0;
+        // High-degree servers: larger, brighter
+        // Singletons: smaller, dimmer
+        const isHighDeg = peerCount > 20;
+        const isSingleton = peerCount <= 1;
+        const radius = isHighDeg ? 10 : (isSingleton ? 4 : 7);
+        const fillOpacity = isHighDeg ? 0.95 : (isSingleton ? 0.5 : 0.85);
+        const weight = isHighDeg ? 3 : (isSingleton ? 1 : 2);
+        const borderColor = isHighDeg ? '#222' : (isSingleton ? '#ccc' : '#fff');
+
         const circle = L.circleMarker([n.lat, n.lon], {
-            radius: 7, fillColor: color, color: '#fff', weight: 2,
-            opacity: 0.95, fillOpacity: 0.85,
+            radius, fillColor: color, color: borderColor, weight,
+            opacity: 0.95, fillOpacity,
             interactive: true, bubblingMouseEvents: false,
         });
         circle.bindTooltip(buildNodeTooltip(n), {sticky: true, direction: 'top', offset: [0, -8]});
@@ -1476,14 +1485,21 @@ function renderMapData() {
     SA.pointLayer = L.layerGroup(markers).addTo(SA.map);
     SA.centerLayer = L.layerGroup(centerMarkers).addTo(SA.map);
     renderLegend();
+    // Restore cluster focus if active
+    if (SA._clusterFocus && _clusterFocusLayer && !SA.map.hasLayer(_clusterFocusLayer)) {
+        _clusterFocusLayer.addTo(SA.map);
+    }
 }
 
 function buildNodeTooltip(n) {
     const p = n.ip ? n.ip.split('.') : [];
     const sn = p.length >= 3 ? p[0]+'.'+p[1]+'.'+p[2]+'.0/24' : '';
-    const srv = n.is_server ? ' 🖥' : '';
-    return `<div class="sa-point-tooltip"><b>${escapeHtml(n.ip)}</b>${srv}<br>` +
+    const pc = n.peer_count || 0;
+    const label = pc > 20 ? ' 🔥服务器' : (n.is_server ? ' 🖥' : '');
+    const degHint = pc > 0 ? `<span style="color:#e76f51;">${pc} 对端</span><br>` : '';
+    return `<div class="sa-point-tooltip"><b>${escapeHtml(n.ip)}</b>${label}<br>` +
         (n.host ? `<span style="color:#2a9d8f;">${escapeHtml(n.host)}</span><br>` : '') +
+        degHint +
         (sn ? `<span style="color:#888;">子网: ${sn}</span><br>` : '') +
         `${escapeHtml(n.city||'')}, ${escapeHtml(n.country||'')}<br>` +
         (n.isp ? `<span style="color:#666;">${escapeHtml(n.isp)}</span><br>` : '') +
@@ -2184,8 +2200,28 @@ function loadClusterDetail(label) {
     .then(data => {
         hideLoading();
         if (data.error) { showError(data.error); return; }
-        focusClusterOnMap(data);
-        showClusterDetailPanelV2(data);
+        // Ensure map exists — go to step 4 if needed
+        if (!SA.map) {
+            goStep(4);
+            // Wait for map to finish initializing, then focus
+            let attempts = 0;
+            function waitThenFocus() {
+                if (SA.map) {
+                    focusClusterOnMap(data);
+                    showClusterDetailPanelV2(data);
+                } else if (attempts < 30) {
+                    attempts++;
+                    setTimeout(waitThenFocus, 200);
+                } else {
+                    // Fallback: just show panel without map focus
+                    showClusterDetailPanelV2(data);
+                }
+            }
+            setTimeout(waitThenFocus, 500);
+        } else {
+            focusClusterOnMap(data);
+            showClusterDetailPanelV2(data);
+        }
     })
     .catch(err => { hideLoading(); showError('加载失败: ' + err.message); });
 }
@@ -2320,8 +2356,8 @@ function focusClusterOnMap(data) {
 
 function clearClusterFocus() {
     if (_clusterFocusLayer && SA.map) { SA.map.removeLayer(_clusterFocusLayer); _clusterFocusLayer = null; }
-    if (_clusterNodeLayer && SA.map) { SA.map.removeLayer(_clusterNodeLayer); _clusterNodeLayer = null; }
     SA._clusterFocus = null;
+    SA._highlightedNodeEdges = null;
 
     // Restore normal markers
     if (SA.map && SA.nodes && SA.nodes.length) {