fix(earth): fix satellite trail origin line and sync button state

- Fill unfilled trail points with satellite position instead of (0,0,0)
- Update toggle-satellites button state after auto-show on init
- Remove trailsReady flag since it's no longer needed

frontend/public/earth/js/main.js

@@ -191,16 +191,27 @@ async function loadData(showWhiteSphere = false) {
   
   setLoading(true);
   try {
-    console.log('开始加载电缆数据...');
+    console.log('开始加载数据...');
-    await loadGeoJSONFromPath(scene, getEarth());
+    await Promise.all([
-    console.log('电缆数据加载完成');
+      (async () => {
-    await loadLandingPoints(scene, getEarth());
+        await loadGeoJSONFromPath(scene, getEarth());
-    console.log('登陆点数据加载完成');
+        console.log('电缆数据加载完成');
-    
+        await loadLandingPoints(scene, getEarth());
-    const satCount = await loadSatellites();
+        console.log('登陆点数据加载完成');
-    console.log(`卫星数据加载完成: ${satCount} 颗`);
+      })(),
-    updateSatellitePositions();
+      (async () => {
-    console.log('卫星位置已更新');
+        const satCount = await loadSatellites();
+        console.log(`卫星数据加载完成: ${satCount} 颗`);
+        updateSatellitePositions();
+        console.log('卫星位置已更新');
+        toggleSatellites(true);
+        const satBtn = document.getElementById('toggle-satellites');
+        if (satBtn) {
+          satBtn.classList.add('active');
+          satBtn.querySelector('.tooltip').textContent = '隐藏卫星';
+        }
+      })()
+    ]);
   } catch (error) {
     console.error('加载数据失败:', error);
     showStatusMessage('加载数据失败: ' + error.message, 'error');

frontend/public/earth/js/satellites.js

@@ -291,9 +291,9 @@ export function updateSatellitePositions(deltaTime = 0) {
         trailColors[trailIdx + 1] = g * alpha;
         trailColors[trailIdx + 2] = b * alpha;
       } else {
-        trailPositions[trailIdx] = 0;
+        trailPositions[trailIdx] = pos.x;
-        trailPositions[trailIdx + 1] = 0;
+        trailPositions[trailIdx + 1] = pos.y;
-        trailPositions[trailIdx + 2] = 0;
+        trailPositions[trailIdx + 2] = pos.z;
         trailColors[trailIdx] = 0;
         trailColors[trailIdx + 1] = 0;
         trailColors[trailIdx + 2] = 0;