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

eclipse/saros_extended.go

@@ -85,7 +85,7 @@ func sarosNumber(k, phase int) int {
 		anchors, base = lunarSarosAnchors[:], 1
 	}
 	anchor := decodeSarosMagic(anchors[len(anchors)/2], base+len(anchors)/2)
-	refTT := basic.JDECalc(int(anchor.Year), int(anchor.Month), float64(anchor.Day))
+	refTT := basic.JDCalc(int(anchor.Year), int(anchor.Month), float64(anchor.Day))
 	refK, _ := sarosLunation(refTT, phase)
 	delta := k - refK
 	column := (38 * delta) % sarosCycleLunations