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_bright_limb_test.go

@@ -11,7 +11,7 @@ func TestMoonBrightLimbPositionAngleMeeusExample(t *testing.T) {
 }
 
 func TestMoonBrightLimbPositionAngleNFullMatchesDefault(t *testing.T) {
-	jd := TD2UT(Date2JDE(time.Date(2026, 4, 28, 9, 30, 45, 0, time.UTC)), true)
+	jd := UTC2TT(Date2JD(time.Date(2026, 4, 28, 9, 30, 45, 0, time.UTC)))
 
 	got := MoonBrightLimbPositionAngle(jd)
 	gotN := MoonBrightLimbPositionAngleN(jd, -1)
@@ -21,7 +21,7 @@ func TestMoonBrightLimbPositionAngleNFullMatchesDefault(t *testing.T) {
 }
 
 func TestMoonTopocentricBrightLimbPositionAngleSampleFiniteAndInRange(t *testing.T) {
-	jd := TD2UT(Date2JDE(time.Date(2026, 4, 28, 9, 30, 45, 0, time.UTC)), true)
+	jd := UTC2TT(Date2JD(time.Date(2026, 4, 28, 9, 30, 45, 0, time.UTC)))
 	got := MoonTopocentricBrightLimbPositionAngle(jd, 121.4737, 31.2304, 4)
 
 	assertFiniteRange(t, "MoonTopocentricBrightLimbPositionAngle", got, 0, 360, true)