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

lite/sun/sun.go

@@ -6,7 +6,6 @@ import (
 	"math"
 	"time"
 
-	"b612.me/astro/basic"
 	lite "b612.me/astro/lite/internal"
 )
 
@@ -17,68 +16,68 @@ var (
 
 // TrueLo 轻量真黄经 / lightweight true ecliptic longitude.
 func TrueLo(date time.Time) float64 {
-	return lite.SunTrueLo(basic.Date2JD(date.UTC()))
+	return lite.SunTrueLo(lite.Date2JD(date.UTC()))
 }
 
 // ApparentLo 轻量视黄经 / lightweight apparent ecliptic longitude.
 func ApparentLo(date time.Time) float64 {
-	return lite.SunApparentLo(basic.Date2JD(date.UTC()))
+	return lite.SunApparentLo(lite.Date2JD(date.UTC()))
 }
 
 // Distance 轻量日地距离 / lightweight Sun-Earth distance in AU.
 func Distance(date time.Time) float64 {
-	return lite.SunDistanceAU(basic.Date2JD(date.UTC()))
+	return lite.SunDistanceAU(lite.Date2JD(date.UTC()))
 }
 
 // TrueRa 轻量真赤经 / lightweight true right ascension.
 func TrueRa(date time.Time) float64 {
-	ra, _ := lite.SunTrueRaDec(basic.Date2JD(date.UTC()))
+	ra, _ := lite.SunTrueRaDec(lite.Date2JD(date.UTC()))
 	return ra
 }
 
 // TrueDec 轻量真赤纬 / lightweight true declination.
 func TrueDec(date time.Time) float64 {
-	_, dec := lite.SunTrueRaDec(basic.Date2JD(date.UTC()))
+	_, dec := lite.SunTrueRaDec(lite.Date2JD(date.UTC()))
 	return dec
 }
 
 // TrueRaDec 轻量真赤经、真赤纬 / lightweight true right ascension and declination.
 func TrueRaDec(date time.Time) (float64, float64) {
-	return lite.SunTrueRaDec(basic.Date2JD(date.UTC()))
+	return lite.SunTrueRaDec(lite.Date2JD(date.UTC()))
 }
 
 // ApparentRa 轻量视赤经 / lightweight apparent right ascension.
 func ApparentRa(date time.Time) float64 {
-	ra, _ := lite.SunApparentRaDec(basic.Date2JD(date.UTC()))
+	ra, _ := lite.SunApparentRaDec(lite.Date2JD(date.UTC()))
 	return ra
 }
 
 // ApparentDec 轻量视赤纬 / lightweight apparent declination.
 func ApparentDec(date time.Time) float64 {
-	_, dec := lite.SunApparentRaDec(basic.Date2JD(date.UTC()))
+	_, dec := lite.SunApparentRaDec(lite.Date2JD(date.UTC()))
 	return dec
 }
 
 // ApparentRaDec 轻量视赤经、视赤纬 / lightweight apparent right ascension and declination.
 func ApparentRaDec(date time.Time) (float64, float64) {
-	return lite.SunApparentRaDec(basic.Date2JD(date.UTC()))
+	return lite.SunApparentRaDec(lite.Date2JD(date.UTC()))
 }
 
 // HourAngle 轻量时角 / lightweight hour angle.
 func HourAngle(date time.Time, lon, lat float64) float64 {
-	_, _, hourAngle := lite.HorizontalCoordinates(ApparentRa(date), ApparentDec(date), basic.Date2JD(date.UTC()), lon, lat)
+	_, _, hourAngle := lite.HorizontalCoordinates(ApparentRa(date), ApparentDec(date), lite.Date2JD(date.UTC()), lon, lat)
 	return hourAngle
 }
 
 // Azimuth 轻量方位角 / lightweight azimuth.
 func Azimuth(date time.Time, lon, lat float64) float64 {
-	_, azimuth, _ := lite.HorizontalCoordinates(ApparentRa(date), ApparentDec(date), basic.Date2JD(date.UTC()), lon, lat)
+	_, azimuth, _ := lite.HorizontalCoordinates(ApparentRa(date), ApparentDec(date), lite.Date2JD(date.UTC()), lon, lat)
 	return azimuth
 }
 
 // Altitude 轻量高度角 / lightweight altitude.
 func Altitude(date time.Time, lon, lat float64) float64 {
-	altitude, _, _ := lite.HorizontalCoordinates(ApparentRa(date), ApparentDec(date), basic.Date2JD(date.UTC()), lon, lat)
+	altitude, _, _ := lite.HorizontalCoordinates(ApparentRa(date), ApparentDec(date), lite.Date2JD(date.UTC()), lon, lat)
 	return altitude
 }
 
@@ -89,7 +88,7 @@ func Zenith(date time.Time, lon, lat float64) float64 {
 
 // RiseTime 轻量日出时刻 / lightweight sunrise time.
 func RiseTime(date time.Time, lon, lat, height float64, aero bool) (time.Time, error) {
-	if result, err, handled := civiltime.Event(date, basic.ErrNotOnThisDate, func(d time.Time) (time.Time, error) {
+	if result, err, handled := civiltime.Event(date, lite.ErrNotOnThisDate, func(d time.Time) (time.Time, error) {
 		return RiseTime(d, lon, lat, height, aero)
 	}); handled {
 		return result, err
@@ -99,7 +98,7 @@ func RiseTime(date time.Time, lon, lat, height float64, aero bool) (time.Time, e
 
 // SetTime 轻量日落时刻 / lightweight sunset time.
 func SetTime(date time.Time, lon, lat, height float64, aero bool) (time.Time, error) {
-	if result, err, handled := civiltime.Event(date, basic.ErrNotOnThisDate, func(d time.Time) (time.Time, error) {
+	if result, err, handled := civiltime.Event(date, lite.ErrNotOnThisDate, func(d time.Time) (time.Time, error) {
 		return SetTime(d, lon, lat, height, aero)
 	}); handled {
 		return result, err
@@ -109,11 +108,11 @@ func SetTime(date time.Time, lon, lat, height float64, aero bool) (time.Time, er
 
 func riseSetTime(date time.Time, lon, lat, height float64, aero, isRise bool) (time.Time, error) {
 	localMidnight := time.Date(date.Year(), date.Month(), date.Day(), 0, 0, 0, 0, date.Location())
-	localJD := basic.Date2JD(localMidnight)
+	localJD := lite.Date2JD(localMidnight)
 	_, offset := localMidnight.Zone()
 	timezone := float64(offset) / 3600.0
 
-	horizonDip := basic.HeightDegreeByLat(height, lat)
+	horizonDip := lite.HeightDegreeByLat(height, lat)
 
 	altitudeFn := func(localJD float64) float64 {
 		utcJD := localJD - timezone/24.0
@@ -121,7 +120,7 @@ func riseSetTime(date time.Time, lon, lat, height float64, aero, isRise bool) (t
 		altitude, _, _ := lite.HorizontalCoordinates(ra, dec, utcJD, lon, lat)
 		residual := altitude + horizonDip
 		if aero {
-			residual += basic.RefractionFromTrueAltitude(altitude, 1010, 10)
+			residual += lite.RefractionFromTrueAltitude(altitude, 1010, 10)
 			residual += liteSunSemidiameterDegrees(lite.SunDistanceAU(utcJD))
 		}
 		return residual
@@ -138,7 +137,7 @@ func riseSetTime(date time.Time, lon, lat, height float64, aero, isRise bool) (t
 			return time.Time{}, err
 		}
 	}
-	return basic.JD2DateByZone(eventJD-timezone/24, date.Location(), false), nil
+	return lite.JD2DateByZone(eventJD-timezone/24, date.Location(), false), nil
 }
 
 func liteSunSemidiameterDegrees(distanceAU float64) float64 {