feat(earth): add cable-landing point relation via city_id

Backend:
- Fix arcgis_landing collector to extract city_id
- Fix arcgis_relation collector to extract city_id
- Fix convert_landing_point_to_geojson to use city_id mapping

Frontend:
- Update landing point cableNames to use array
- Add applyLandingPointVisualState for cable lock highlight
- Dim all landing points when satellite is locked

frontend/public/earth/js/cables.js

@@ -286,7 +286,7 @@ export async function loadLandingPoints(scene, earthObj) {
       sphere.userData = {
         type: 'landingPoint',
         name: properties.name || '未知登陆站',
-        cableName: properties.cable_system || '未知系统',
+        cableNames: properties.cable_names || [],
         country: properties.country || '未知国家',
         status: properties.status || 'Unknown'
       };
@@ -362,3 +362,47 @@ export function getCableStateInfo() {
   });
   return states;
 }
+
+export function getLandingPointsByCableName(cableName) {
+  return landingPoints.filter(lp => lp.userData.cableNames?.includes(cableName));
+}
+
+export function getAllLandingPoints() {
+  return landingPoints;
+}
+
+export function applyLandingPointVisualState(lockedCableName, dimAll = false) {
+  const pulse = (Math.sin(Date.now() * 0.003) + 1) * 0.5;
+  const brightness = 0.3;
+  
+  landingPoints.forEach(lp => {
+    const isRelated = !dimAll && lp.userData.cableNames?.includes(lockedCableName);
+    
+    if (isRelated) {
+      lp.material.color.setHex(0xffaa00);
+      lp.material.emissive.setHex(0x442200);
+      lp.material.emissiveIntensity = 0.5 + pulse * 0.5;
+      lp.material.opacity = 0.8 + pulse * 0.2;
+      lp.scale.setScalar(1.2 + pulse * 0.3);
+    } else {
+      const r = 255 * brightness;
+      const g = 170 * brightness;
+      const b = 0 * brightness;
+      lp.material.color.setRGB(r / 255, g / 255, b / 255);
+      lp.material.emissive.setHex(0x000000);
+      lp.material.emissiveIntensity = 0;
+      lp.material.opacity = 0.3;
+      lp.scale.setScalar(1.0);
+    }
+  });
+}
+
+export function resetLandingPointVisualState() {
+  landingPoints.forEach(lp => {
+    lp.material.color.setHex(0xffaa00);
+    lp.material.emissive.setHex(0x442200);
+    lp.material.emissiveIntensity = 0.5;
+    lp.material.opacity = 1.0;
+    lp.scale.setScalar(1.0);
+  });
+}

frontend/public/earth/js/main.js

@@ -13,7 +13,7 @@ import {
   hideTooltip 
 } from './ui.js';
 import { createEarth, createClouds, createTerrain, createStars, createGridLines, toggleTerrain, getEarth } from './earth.js';
-import { loadGeoJSONFromPath, loadLandingPoints, handleCableClick, clearCableSelection, getCableLines, getCablesById, lockedCable as cableLocked, getCableState, setCableState, clearAllCableStates } from './cables.js';
+import { loadGeoJSONFromPath, loadLandingPoints, handleCableClick, clearCableSelection, getCableLines, getCablesById, lockedCable as cableLocked, getCableState, setCableState, clearAllCableStates, applyLandingPointVisualState, resetLandingPointVisualState, getAllLandingPoints } from './cables.js';
 import { createSatellites, loadSatellites, updateSatellitePositions, toggleSatellites, toggleTrails, getShowSatellites, selectSatellite, getSatelliteData, getSatellitePoints, setSatelliteRingState, updateLockedRingPosition, updateHoverRingPosition, getSatellitePositions } from './satellites.js';
 import { setupControls, getAutoRotate, getShowTerrain, zoomLevel, setAutoRotate, toggleAutoRotate, resetView } from './controls.js';
 import { initInfoCard, showInfoCard, hideInfoCard, getCurrentType, setInfoCardNoBorder } from './info-card.js';
@@ -475,6 +475,14 @@ function animate() {
   
   applyCableVisualState();
   
+  if (lockedObjectType === 'cable' && lockedObject) {
+    applyLandingPointVisualState(lockedObject.userData.name, false);
+  } else if (lockedObjectType === 'satellite' && lockedSatellite) {
+    applyLandingPointVisualState(null, true);
+  } else {
+    resetLandingPointVisualState();
+  }
+  
   updateSatellitePositions(16);
   
   const satPositions = getSatellitePositions();