feat: 新增月掩与日月食地理绘图并提升观测计算精度

- 新增月掩恒星和行星：支持搜索、掩甚点、全球掩带及固定地点轨迹计算
- 支持恒星星表坐标转换、有限盘面行星接触事件和月掩 SVG 输出
- 新增日月食及月掩全球投影图、时间标记和 GeoJSON 地理数据接口
- 扩展日食中心线、南北界及偏食足迹采样，支持极区投影
- 修正站心时角、月出月落、月球视半径、折射和恒星自行计算
- 优化内外行星事件搜索、边界选择、极端输入处理和计算稳定性

eclipse/solar_path_test.go

@@ -64,8 +64,9 @@ func TestSolarEclipsePartialFootprintsKeepLocation(t *testing.T) {
 	footprints, ok := SolarEclipsePartialFootprints(
 		time.Date(2024, 4, 8, 12, 0, 0, 0, loc),
 		SolarEclipsePartialFootprintOptions{
-			Step:           30 * time.Minute,
-			BoundaryPoints: 72,
+			Step:              30 * time.Minute,
+			BoundaryPoints:    72,
+			CentralShadowStep: 10 * time.Minute,
 		},
 	)
 	if !ok {
@@ -80,6 +81,9 @@ func TestSolarEclipsePartialFootprintsKeepLocation(t *testing.T) {
 	if footprints.BoundaryPoints != 72 {
 		t.Fatalf("boundary points mismatch: got %d want 72", footprints.BoundaryPoints)
 	}
+	if footprints.CentralShadowStep != 10*time.Minute || len(footprints.CentralShadowFootprints) == 0 {
+		t.Fatalf("central shadow sampling mismatch: step=%s footprints=%d", footprints.CentralShadowStep, len(footprints.CentralShadowFootprints))
+	}
 
 	for _, item := range []struct {
 		name string
@@ -89,6 +93,15 @@ func TestSolarEclipsePartialFootprintsKeepLocation(t *testing.T) {
 		{name: "Footprints[0].Time", tm: footprints.Footprints[0].Time},
 		{name: "Footprints[last].Time", tm: footprints.Footprints[len(footprints.Footprints)-1].Time},
 		{name: "Boundary point", tm: footprints.Footprints[0].Boundaries[0][0].Time},
+		{name: "P1 contact", tm: footprints.P1.Time},
+		{name: "P2 contact", tm: footprints.P2.Time},
+		{name: "P3 contact", tm: footprints.P3.Time},
+		{name: "P4 contact", tm: footprints.P4.Time},
+		{name: "U1 contact", tm: footprints.U1.Time},
+		{name: "U2 contact", tm: footprints.U2.Time},
+		{name: "U3 contact", tm: footprints.U3.Time},
+		{name: "U4 contact", tm: footprints.U4.Time},
+		{name: "Central shadow", tm: footprints.CentralShadowFootprints[0].Time},
 	} {
 		if item.tm.Location() != loc {
 			t.Fatalf("%s location mismatch: got %q want %q", item.name, item.tm.Location(), loc)
@@ -107,6 +120,9 @@ func TestSolarEclipsePartialFootprintsWorkForPartialOnly(t *testing.T) {
 	if footprints.Eclipse.Type != SolarEclipsePartial {
 		t.Fatalf("unexpected eclipse type: got %s want %s", footprints.Eclipse.Type, SolarEclipsePartial)
 	}
+	if !footprints.U1.Time.IsZero() || !footprints.U4.Time.IsZero() || len(footprints.CentralShadowFootprints) != 0 {
+		t.Fatal("partial-only eclipse must not return central-shadow contacts or footprints")
+	}
 }
 
 func TestSolarEclipsePartialFootprintsReturnFalseForNoEvent(t *testing.T) {