feat: 用 react-map-gl + MapLibre 替换 react-simple-maps 实现 2D 地图

- 替换 react-simple-maps/d3-geo/topojson-client 为 react-map-gl + maplibre-gl
- 使用 CARTO dark-matter 免费暗色瓦片，自带国家/城市名标注
- 基于 locale 动态切换地图标注语言（name:zh / name_en）
- MapLibre 原生 heatmap + circle 双层渲染替代 SVG 热力图
- 提取 MapPopup 组件，配合 react-map-gl Popup 实现点击弹窗
- continent page 改为 dynamic import (ssr: false)
- dev 模式去掉 Turbopack 以兼容 maplibre-gl
- 删除 heatmap-layer.tsx 和 react-simple-maps 类型声明

app/[locale]/continent/[slug]/page.tsx

@@ -1,14 +1,22 @@
 "use client";
 
 import { use } from "react";
+import dynamic from "next/dynamic";
 import { useTranslations } from "next-intl";
 import { Navbar } from "@/components/layout/navbar";
 import { ParticleBg } from "@/components/layout/particle-bg";
 import { ViewSwitcher } from "@/components/layout/view-switcher";
-import { ContinentMap } from "@/components/map/continent-map";
 import { StatsPanel } from "@/components/dashboard/stats-panel";
 import { ClawFeed } from "@/components/dashboard/claw-feed";
 
+const ContinentMap = dynamic(
+  () =>
+    import("@/components/map/continent-map").then((m) => ({
+      default: m.ContinentMap,
+    })),
+  { ssr: false }
+);
+
 const continentSlugs = ["asia", "europe", "americas", "africa", "oceania"] as const;
 
 interface PageProps {