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/moon_geocentric_apparent_test.go

@@ -6,7 +6,7 @@ import (
 )
 
 func TestHMoonGeocentricApparentRaDecComponentsMatch(t *testing.T) {
-	jd := TD2UT(JDECalc(2026, 1, 1.25), true)
+	jd := UTC2TT(JDCalc(2026, 1, 1.25))
 
 	ra, dec := HMoonGeocentricApparentRaDec(jd)
 	if diff := math.Abs(ra - HMoonGeocentricApparentRa(jd)); diff > 1e-12 {
@@ -18,7 +18,7 @@ func TestHMoonGeocentricApparentRaDecComponentsMatch(t *testing.T) {
 }
 
 func TestHMoonGeocentricTrueRaDecComponentsMatch(t *testing.T) {
-	jd := TD2UT(JDECalc(2026, 1, 1.25), true)
+	jd := UTC2TT(JDCalc(2026, 1, 1.25))
 
 	ra, dec := HMoonGeocentricTrueRaDec(jd)
 	if diff := math.Abs(ra - HMoonGeocentricTrueRa(jd)); diff > 1e-12 {