feat: 引入可切换星历模型并扩展天象观测链路

- 新增半解析、旧模型、自定义与多源堆叠星历实例，提供 Context、Instance、SPK 读取及状态与视位置计算
- 统一太阳、月球和行星实例接口，扩展黄经穿越、留、相位、最近角距、偕日可见、任意高度升落、轨道节点及凌日等天象查询
- 完善日月食、月掩与凌日的月缘剖面、有限盘面接触、站心修正、局地可见性、全球路径和地图输出
- 新增 SVG、GeoJSON、KML 天象输出及凌日、月掩和月缘地形相关缓存与几何求解
- 新增恒星星表导入与查询，支持 CSV、Hipparcos、BSC5、Stellarium 等格式及名称、交叉标识、锥面检索和星等过滤
- 补充 IAU 2006、地球定向、折射消光、大气观测、轨道传播及半解析行星/月球数据支持
- 将默认未来民用时标切换为 TimeScaleLeapHour，更新 2027–2400 农历速查表、中文日期解析和时区边界处理
- 增加事件基线、跨模型回归、几何边界、月缘地形和输出契约测试，完善中英文手册、示例资源、NOTICE 与忽略规则

basic/jupiter_physical.go

@@ -3,7 +3,6 @@ package basic
 import (
 	"math"
 
-	"b612.me/astro/planet"
 	. "b612.me/astro/tools"
 )
 
@@ -29,10 +28,10 @@ func JupiterCentralMeridians(jde float64) JupiterCentralMeridianInfo {
 	return JupiterCentralMeridiansN(jde, -1)
 }
 
-// JupiterCentralMeridiansN 木星 System I/II/III 中央经线（截断版） / truncated Jupiter System I/II/III central meridians.
-func JupiterCentralMeridiansN(jde float64, n int) JupiterCentralMeridianInfo {
-	observations := jupiterPhysicalObservationsN(jde, n)
-	physical := JupiterPhysicalN(jde, n)
+// JupiterCentralMeridiansNWithInstance 用指定星历实例求值；inst 为 nil 时用进程当前模型 / evaluation with an explicit instance; nil uses the process model.
+func JupiterCentralMeridiansNWithInstance(jde float64, n int, inst *Instance) JupiterCentralMeridianInfo {
+	observations := jupiterPhysicalObservationsN(jde, n, inst)
+	physical := JupiterPhysicalNWithInstance(jde, n, inst)
 	return JupiterCentralMeridianInfo{
 		SystemI:   observations.SystemI,
 		SystemII:  observations.SystemII,
@@ -45,13 +44,15 @@ func JupiterDSDE(jde float64) (ds, de float64) {
 	return JupiterDSDEN(jde, -1)
 }
 
-// JupiterDSDEN 木星 DS/DE 行星中心赤纬（截断版） / truncated Jupiter planetocentric declinations of Sun and Earth.
-func JupiterDSDEN(jde float64, n int) (ds, de float64) {
-	observations := jupiterPhysicalObservationsN(jde, n)
+// JupiterDSDENWithInstance 用指定星历实例求值；inst 为 nil 时用进程当前模型 / evaluation with an explicit instance; nil uses the process model.
+func JupiterDSDENWithInstance(jde float64, n int, inst *Instance) (ds, de float64) {
+	observations := jupiterPhysicalObservationsN(jde, n, inst)
 	return observations.DS, observations.DE
 }
 
-func jupiterPhysicalObservationsN(jde float64, n int) jupiterPhysicalObservationInfo {
+func jupiterPhysicalObservationsN(jde float64, n int, instances ...*Instance) jupiterPhysicalObservationInfo {
+	inst := instanceValue(instances)
+
 	days := jde - 2433282.5
 	julianCentury := days / 36525.0
 
@@ -60,9 +61,9 @@ func jupiterPhysicalObservationsN(jde float64, n int) jupiterPhysicalObservation
 	w1 := (17.71 + 877.90003539*days) * rad
 	w2 := (16.838 + 870.27003539*days) * rad
 
-	earthLon := planet.WherePlanetN(-1, 0, jde, n)
-	earthLat := planet.WherePlanetN(-1, 1, jde, n)
-	earthRadius := planet.WherePlanetN(-1, 2, jde, n)
+	earthLon := PlanetCoordinateNWithInstance(-1, 0, jde, n, inst)
+	earthLat := PlanetCoordinateNWithInstance(-1, 1, jde, n, inst)
+	earthRadius := PlanetCoordinateNWithInstance(-1, 2, jde, n, inst)
 
 	delta := 4.0
 	var jupiterLon float64
@@ -73,9 +74,9 @@ func jupiterPhysicalObservationsN(jde float64, n int) jupiterPhysicalObservation
 	var z float64
 	for i := 0; i < 2; i++ {
 		lightTimeDays := astronomicalUnitLightTimeDays * delta
-		jupiterLon = planet.WherePlanetN(4, 0, jde-lightTimeDays, n)
-		jupiterLat = planet.WherePlanetN(4, 1, jde-lightTimeDays, n)
-		jupiterRadius = planet.WherePlanetN(4, 2, jde-lightTimeDays, n)
+		jupiterLon = PlanetCoordinateNWithInstance(4, 0, jde-lightTimeDays, n, inst)
+		jupiterLat = PlanetCoordinateNWithInstance(4, 1, jde-lightTimeDays, n, inst)
+		jupiterRadius = PlanetCoordinateNWithInstance(4, 2, jde-lightTimeDays, n, inst)
 		x = jupiterRadius*Cos(jupiterLat)*Cos(jupiterLon) - earthRadius*Cos(earthLat)*Cos(earthLon)
 		y = jupiterRadius*Cos(jupiterLat)*Sin(jupiterLon) - earthRadius*Cos(earthLat)*Sin(earthLon)
 		z = jupiterRadius*Sin(jupiterLat) - earthRadius*Sin(earthLat)