feat: 完善日月食与月掩几何链路并扩展历法接口

- 新增日月食中心带、偏食带、阴影足迹、等时线、食分线及升落边界计算，支持极区与混合食拓扑
- 新增日食单时刻阴影求解器、站心状态查询、批量采样和 ΔT 覆盖接口
- 重构恒星与行星月掩路径，补充有限盘面接触、站心修正、掩带宽度、极区投影及升落边界
- 扩展 SVG 与 GeoJSON 输出，支持详细面板、全球/极区/地球投影、边界闭合、时间标记和拓扑签名
- 扩展日月食候选搜索、局地搜索、沙罗序列预计算与范围外推，补充系列锚点和成员一致性校验
- 补齐古历纪年、儒略历独有闰日、多公历候选、历法改革跨日及精确日期运算接口
- 优化 ΔT、章动、恒星时、月球地平线、事件根搜索和本地星历缓存，降低重复计算开销并提升边界稳定

basic/jupiter_satellite_contact_events.go

@@ -336,25 +336,6 @@ func refineJupiterGalileanShadowContactPair(
 		}, true
 }
 
-func refineJupiterGalileanNegativeMetricWindow(
-	seedJD float64,
-	metric func(jd float64) float64,
-) (float64, float64, bool) {
-	activeJD, activeValue, ok := findJupiterGalileanNegativeMetricSeed(seedJD, metric)
-	if !ok {
-		return math.NaN(), math.NaN(), false
-	}
-	start, ok := refineJupiterGalileanNegativeWindowRoot(activeJD, activeValue, -1, metric)
-	if !ok {
-		return math.NaN(), math.NaN(), false
-	}
-	end, ok := refineJupiterGalileanNegativeWindowRoot(activeJD, activeValue, 1, metric)
-	if !ok {
-		return math.NaN(), math.NaN(), false
-	}
-	return start, end, true
-}
-
 func findJupiterGalileanNegativeMetricSeed(
 	seedJD float64,
 	metric func(jd float64) float64,
@@ -593,18 +574,6 @@ func jupiterPenumbraScale(distanceBehindAU, sunDistanceAU float64) float64 {
 	return 1 + distanceBehindAU*(solarRadiusAU+jupiterRadiusAU)/(sunDistanceAU*jupiterRadiusAU)
 }
 
-func jupiterGalileanUmbraRadiusJupiterRadii(satellite int, pathLengthAU, sunDistanceAU float64) float64 {
-	if pathLengthAU <= 0 || sunDistanceAU <= 0 {
-		return math.NaN()
-	}
-	satelliteRadiusAU := jupiterGalileanSatelliteRadiusJupiterRadii(satellite) * jupiterGalileanEquatorialRadiusKM / astronomicalUnitKM
-	umbraRadiusAU := satelliteRadiusAU - pathLengthAU*(solarRadiusAU-satelliteRadiusAU)/sunDistanceAU
-	if umbraRadiusAU <= 0 {
-		return math.NaN()
-	}
-	return umbraRadiusAU / (jupiterGalileanEquatorialRadiusKM / astronomicalUnitKM)
-}
-
 func jupiterGalileanPenumbraRadiusJupiterRadii(satellite int, pathLengthAU, sunDistanceAU float64) float64 {
 	if pathLengthAU <= 0 || sunDistanceAU <= 0 {
 		return math.NaN()