refactor: switch to tsdown (#842)

Author: ilyaliao

package.json

@@ -69,8 +69,8 @@
     "node": ">=14"
   },
   "scripts": {
-    "build": "tsup",
-    "dev": "tsup --watch src",
+    "build": "tsdown",
+    "dev": "tsdown -w",
     "example:build": "npm -C examples/vite-vue3 run build",
     "example:dev": "npm -C examples/vite-vue3 run dev",
     "prepublishOnly": "npm run build",
@@ -122,7 +122,7 @@
     "minimatch": "^10.0.1",
     "pathe": "^2.0.3",
     "rollup": "^4.40.0",
-    "tsup": "^8.4.0",
+    "tsdown": "^0.12.3",
     "typescript": "^5.8.3",
     "vite": "^6.2.6",
     "vitest": "^3.1.1",