fix(site): alias @antv/aimapui-plot to source for CI build

Vercel does a fresh checkout where packages/plot/dist does not exist
(dist/ is gitignored). site imports @antv/aimapui-plot, whose
package.json exports point at dist/index.es.js, so vite could not
resolve its entry — build failed: 'Failed to resolve entry for package
"@antv/aimapui-plot"'.

core is already aliased to source (commit 0c83624) to avoid building
core first. Apply the same pattern to plot: alias @antv/aimapui-plot to
../plot/src/index.ts. plot's source imports only core (already
aliased), @antv/l7, react, geojson, and relative css — all resolvable
by vite. Verified by removing packages/plot/dist and building site:
62 pages generated successfully.

Author: lzxue

packages/site/vite.config.ts

@@ -19,7 +19,9 @@ export default defineConfig({
   resolve: {
     alias: {
       '@': resolve(__dirname, 'src'),
-      // 直接引用 core 源码，避免需要先构建 core 包
+      // 直接引用源码，避免需要先构建对应包（CI 全新 checkout 仓库内无 dist）
+      // 注意 plot 别名须在 core 之前，避免前缀歧义
+      '@antv/aimapui-plot': resolve(__dirname, '../plot/src/index.ts'),
       '@antv/aimapui': resolve(__dirname, '../core/src/index.ts'),
     },
     extensions: ['.mjs', '.js', '.ts', '.jsx', '.tsx', '.json'],