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

coord/perf_bench_test.go

@@ -24,15 +24,16 @@ func BenchmarkTopocentricEcliptic(b *testing.B) {
 	benchmarkEclipticSink = sink
 }
 
-func BenchmarkTopocentricEclipticLegacy(b *testing.B) {
+// BenchmarkTopocentricEclipticTwoWrappers 量的是分别调用 Lo/Bo 两个包装（各解一次）与组合入口的差距。
+func BenchmarkTopocentricEclipticTwoWrappers(b *testing.B) {
 	date, lon, lat, observerLon, observerLat, distanceAU, height := benchmarkEclipticInputs()
 	b.ReportAllocs()
 	b.ResetTimer()
 	sink := Ecliptic{}
 	for i := 0; i < b.N; i++ {
 		sink = Ecliptic{
-			Lon: basic.TopocentricLo(lon, lat, observerLat, observerLon, jdeUTC(date), distanceAU, height),
-			Lat: basic.TopocentricBo(lon, lat, observerLat, observerLon, jdeUTC(date), distanceAU, height),
+			Lon: basic.TopocentricLo(lon, lat, observerLat, observerLon, jdUTC(date), distanceAU, height),
+			Lat: basic.TopocentricBo(lon, lat, observerLat, observerLon, jdUTC(date), distanceAU, height),
 		}
 	}
 	benchmarkEclipticSink = sink