feat: 完善时标与天象几何计算并扩展输出接口

- 新增时标、ΔT 模型、质心时间与 UT1 支持
- 改进日月食、月掩、行星事件及路径边界计算
- 完善恒星三维自行与动态距离传播
- 扩展 SVG、GeoJSON、KML 输出与底层距离换算工具
- 整理中英文手册、示例资源及回归测试

eclipse/svg/solar_map_labels.go

@@ -350,6 +350,7 @@ func solarEclipseContactMarkerSpecs(info eclipsecore.SolarEclipsePartialFootprin
 
 // solarEclipseMapPlacePointLabels 按重要性放置点标注：食甚最先占位，其余标注再让开。
 func solarEclipseMapPlacePointLabels(
+	civilPartial eclipsecore.SolarEclipsePartialFootprintsInfo,
 	partial eclipsecore.SolarEclipsePartialFootprintsInfo,
 	central eclipsecore.SolarEclipsePath,
 	hasCentral bool,
@@ -376,7 +377,7 @@ func solarEclipseMapPlacePointLabels(
 			}, frame)
 	}
 	result.contacts = solarEclipseMapPlaceContactLabels(partial, frame, labels)
-	result.subsolar = solarEclipseMapPlaceSubsolarLabel(partial.Eclipse, frame, options.Language, labels)
+	result.subsolar = solarEclipseMapPlaceSubsolarLabel(civilPartial.Eclipse, frame, options.Language, labels)
 	if hasCentral {
 		result.times = solarEclipseMapPlaceTimeLabels(central, frame, options, labels)
 	}