feat: 完善水星与金星全球凌日搜索及制图导出

- 基于平均下合周期与节点相位预筛候选，减少无效星历计算；跳过无法求解的单个会合周期，避免有限覆盖星历导致搜索提前终止 - 引入影轴 γ、半影半径及地球尺度几何判定，结合站心可见性识别地心无接触、仅部分地区可见的掠凌 - 添加金星 243 年、水星 46 年周期族编号，并明确编号适用范围及未分配时的零值语义 - 为 SVG、GeoJSON 和 KML 增加站心部分凌日可见区，适配接触等时线、几何元数据、图层样式及取景；为地心无接触凌日事件增加正射图，按可见区球面面积加权居中
2026-10-20 22:35:39 +08:00
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				<svg xmlns="http://www.w3.org/2000/svg" width="1200" height="800" viewBox="0 0 1200 800" role="img" aria-label="1937-05-11 Transit of Mercury Global Visibility" data-center-longitude="66.312801" data-center-latitude="-24.657741"><defs><clipPath id="transit-map-clip"><circle cx="600.000" cy="410.000" r="268.000"/></clipPath></defs><rect width="100%" height="100%" fill="#efefed"/><rect x="22" y="18" width="1156" height="764" fill="#ffffff" stroke="#c9c9c6" stroke-width="1.2"/><text x="600.000" y="47" fill="#111111" font-family="Georgia, 'Times New Roman', serif" font-size="24" font-weight="700" text-anchor="middle">1937-05-11 Transit of Mercury Global Visibility</text><text x="600.000" y="82" fill="#293235" font-family="Arial, sans-serif" font-size="13" text-anchor="middle">Greatest 16:59:16 \| Partial transit; no geocentric contacts (CST)</text><text x="600.000" y="100" fill="#293235" font-family="Arial, sans-serif" font-size="13" text-anchor="middle">γ -134.2117 \| Series 5 (46 yr) 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