refactor: migrate to tsdown (#629)

Author: sxzz

package.json

@@ -105,8 +105,8 @@
   ],
   "scripts": {
     "build": "pnpm run build:core && pnpm run build:runtime",
-    "build:core": "tsup",
-    "build:runtime": "tsup --config tsup-runtime.config.ts",
+    "build:core": "tsdown",
+    "build:runtime": "tsdown --config tsdown-runtime.config.ts",
     "dev": "pnpm run vitest --ui",
     "vitest": "vitest --typecheck",
     "docs": "vitepress dev docs",
@@ -182,7 +182,7 @@
     "rollup": "^4.40.2",
     "semver": "^7.7.1",
     "ts-expect": "^1.3.0",
-    "tsup": "^8.4.0",
+    "tsdown": "^0.11.0",
     "typescript": "^5.8.3",
     "unplugin-auto-import": "^19.2.0",
     "unplugin-vue-markdown": "^28.3.1",