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/apsis_test.go

@@ -62,7 +62,7 @@ func TestEarthApsisMatchesHorizonsBaseline(t *testing.T) {
 			t.Fatalf("unknown earth apsis kind %q", sample.Kind)
 		}
 
-		gotTime := JDE2DateByZone(got.JDE, time.UTC, false)
+		gotTime := JD2DateByZone(got.JD, time.UTC, false)
 		timeDiff := gotTime.Sub(wantTime)
 		if timeDiff < 0 {
 			timeDiff = -timeDiff
@@ -139,7 +139,7 @@ func TestMoonApsisMatchesHorizonsBaseline(t *testing.T) {
 			t.Fatalf("unknown moon apsis kind %q", sample.Kind)
 		}
 
-		gotTime := JDE2DateByZone(got.JDE, time.UTC, false)
+		gotTime := JD2DateByZone(got.JD, time.UTC, false)
 		timeDiff := gotTime.Sub(wantTime)
 		if timeDiff < 0 {
 			timeDiff = -timeDiff