fix(map): proxy all carto CDN requests to bypass CORS#19
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Carto CDN returns Access-Control-Allow-Origin with http:// instead of https://, blocking style, tile, sprite and glyph requests. Proxy all Carto URLs through Next.js rewrites via transformRequest so the browser makes same-origin requests only. Remove now-unused preconnect hints.
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Summary
Production (
https://zipkit.app) 遭遇 Carto CDN 的 CORS 問題 -- CDN 回傳的Access-Control-Allow-Origin是http://zipkit.app（缺少 TLS），導致 style、tiles、sprites、glyphs 全部被瀏覽器阻擋。#18 只代理了 style.json，但 style 內部引用的 tile metadata、sprite、glyph 等資源也來自同樣的 Carto 網域，同樣被 CORS 阻擋。
此 PR 透過 Next.js rewrites + MapLibre
transformRequest將所有basemaps.cartocdn.com及tiles.basemaps.cartocdn.com請求代理到同源路徑/map-cdn/*，徹底繞過 CORS。同時移除不再需要的 preconnect hints。Test plan
pnpm dev-> Network tab 確認所有地圖請求走/map-cdn/...