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/lunar_limb_bench_test.go

@@ -0,0 +1,105 @@
+package basic
+
+// 月缘路径基准：与同一调用的圆月面版本成对，改动扫描步长或剪枝时对照两者倍率。
+
+import (
+	"testing"
+	"time"
+
+	"b612.me/astro/moon/limb"
+)
+
+func benchmarkLocalSolarEclipseLimb(b *testing.B, profile LunarLimb) {
+	seed := Date2JD(time.Date(2035, 9, 2, 0, 0, 0, 0, time.UTC))
+	options := SolarEclipseOptions{RadiusModel: SolarEclipseModelNASABulletinSplitK, LunarLimb: profile}
+	b.ResetTimer()
+	for index := 0; index < b.N; index++ {
+		LocalSolarEclipseWithOptionsWithInstance(seed, 116.2310, 39.70, 0, options, nil)
+	}
+}
+
+func BenchmarkLocalSolarEclipseCircular20350902(b *testing.B) { benchmarkLocalSolarEclipseLimb(b, nil) }
+
+func BenchmarkLocalSolarEclipseLunarLimb20350902(b *testing.B) {
+	benchmarkLocalSolarEclipseLimb(b, limb.Default())
+}
+
+func benchmarkStarOccultationLimb(b *testing.B, profile LunarLimb) {
+	start := time.Date(2026, 2, 10, 12, 0, 0, 0, time.UTC)
+	options := OccultationSearchOptions{LunarLimb: profile}
+	b.ResetTimer()
+	for index := 0; index < b.N; index++ {
+		if _, err := FindStarOccultationsWithInstance(start, start.Add(36*time.Hour), limbTestAntares, 41.5907, -55.07036, 0, options, nil); err != nil {
+			b.Fatal(err)
+		}
+	}
+}
+
+func BenchmarkStarOccultationCircularAntares(b *testing.B) { benchmarkStarOccultationLimb(b, nil) }
+
+func BenchmarkStarOccultationLunarLimbAntares(b *testing.B) {
+	benchmarkStarOccultationLimb(b, limb.Default())
+}
+
+func benchmarkPlanetOccultationLimb(b *testing.B, profile LunarLimb) {
+	start := time.Date(2024, time.August, 21, 1, 30, 0, 0, time.UTC)
+	end := time.Date(2024, time.August, 21, 4, 0, 0, 0, time.UTC)
+	options := OccultationSearchOptions{LunarLimb: profile}
+	b.ResetTimer()
+	for index := 0; index < b.N; index++ {
+		if _, err := FindPlanetOccultationsWithInstance(start, end, OccultationSaturn, -30.072, 43.562592, 0, options, nil); err != nil {
+			b.Fatal(err)
+		}
+	}
+}
+
+func BenchmarkPlanetOccultationCircularSaturnGraze(b *testing.B) {
+	benchmarkPlanetOccultationLimb(b, nil)
+}
+
+func BenchmarkPlanetOccultationLunarLimbSaturnGraze(b *testing.B) {
+	benchmarkPlanetOccultationLimb(b, limb.Default())
+}
+
+func BenchmarkStarOccultationLimbProfileAntares(b *testing.B) {
+	info := StarOccultationInfo{Greatest: time.Date(2026, 2, 11, 3, 47, 15, 0, time.UTC), Observer: Observer{Longitude: 41.5907, Latitude: -55.07036}}
+	profile := limb.Default()
+	b.ResetTimer()
+	for index := 0; index < b.N; index++ {
+		if _, err := StarOccultationLimbProfileWithInstance(info, limbTestAntares, profile, StarOccultationLimbProfileOptions{}, nil); err != nil {
+			b.Fatal(err)
+		}
+	}
+}
+
+func benchmarkSolarEclipseCentralPathLimb(b *testing.B, profile LunarLimb) {
+	seed := Date2JD(time.Date(2035, 9, 2, 0, 0, 0, 0, time.UTC))
+	b.ResetTimer()
+	for index := 0; index < b.N; index++ {
+		SolarEclipseCentralPathNASABulletinSplitKWithInstance(seed, SolarEclipsePathOptions{LunarLimb: profile}, nil)
+	}
+}
+
+func BenchmarkSolarEclipseCentralPathCircular20350902(b *testing.B) {
+	benchmarkSolarEclipseCentralPathLimb(b, nil)
+}
+
+func BenchmarkSolarEclipseCentralPathLunarLimb20350902(b *testing.B) {
+	benchmarkSolarEclipseCentralPathLimb(b, limb.Default())
+}
+
+func benchmarkSolarEclipsePartialFootprintsLimb(b *testing.B, profile LunarLimb) {
+	seed := Date2JD(time.Date(2035, 9, 2, 0, 0, 0, 0, time.UTC))
+	b.ResetTimer()
+	for index := 0; index < b.N; index++ {
+		SolarEclipsePartialFootprintsNASABulletinSplitKWithInstance(seed, SolarEclipsePartialFootprintOptions{LunarLimb: profile}, nil)
+	}
+}
+
+func BenchmarkSolarEclipsePartialFootprintsCircular20350902(b *testing.B) {
+	benchmarkSolarEclipsePartialFootprintsLimb(b, nil)
+}
+
+func BenchmarkSolarEclipsePartialFootprintsLunarLimb20350902(b *testing.B) {
+	benchmarkSolarEclipsePartialFootprintsLimb(b, limb.Default())
+}