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

basic/solar_eclipse_central_envelope_test.go

@@ -6,7 +6,7 @@ import (
 )
 
 func TestSolarEclipse20120521CentralBandIsContinuousCriticalEnvelope(t *testing.T) {
-	seed := JDECalc(2012, 5, 21)
+	seed := JDCalc(2012, 5, 21)
 	result := SolarEclipsePartialFootprints(seed, SolarEclipsePartialFootprintOptions{
 		StepDays: 2.0 / 1440.0, BoundaryPoints: 96,
 	})
@@ -72,7 +72,7 @@ func TestSolarEclipse20120521CentralBandIsContinuousCriticalEnvelope(t *testing.
 }
 
 func TestSolarEclipseCentralEnvelopeIndependentOfRiseSetOutput(t *testing.T) {
-	seed := JDECalc(2012, 5, 21)
+	seed := JDCalc(2012, 5, 21)
 	withCurves := SolarEclipsePartialFootprints(seed, SolarEclipsePartialFootprintOptions{StepDays: 2.0 / 1440, BoundaryPoints: 96})
 	withoutCurves := SolarEclipsePartialFootprints(seed, SolarEclipsePartialFootprintOptions{StepDays: 2.0 / 1440, BoundaryPoints: 96, DisableRiseSetCurves: true})
 	if len(withoutCurves.CentralBandSegments) == 0 {