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

geojson/path_regression_p2_test.go

@@ -20,11 +20,11 @@ import (
 // exercising antimeridian, polar and non-central topology in normal tests.
 func TestSolarEclipseP2SarosGeoJSONSamples(t *testing.T) {
 	const sarosDays = 6585.321314
-	seed := basic.JDECalc(2024, 4, 8)
+	seed := basic.JDCalc(2024, 4, 8)
 	for _, familyIndex := range []int{-28, -21, -14, -7, 0, 7, 14, 21, 28} {
 		familyIndex := familyIndex
 		t.Run("saros-"+formatP2SignedIndex(familyIndex), func(t *testing.T) {
-			date := basic.JDE2DateByZone(seed+float64(familyIndex)*sarosDays, time.UTC, false)
+			date := basic.JD2DateByZone(seed+float64(familyIndex)*sarosDays, time.UTC, false)
 			partial, ok := eclipse.SolarEclipsePartialFootprints(date, eclipse.SolarEclipsePartialFootprintOptions{
 				Step: 10 * time.Minute, BoundaryPoints: 96, CentralShadowStep: 5 * time.Minute,
 				DisableRiseSet: true,