chore: bump package version to 0.8.7

Author: wave-builder[bot]

package.json

@@ -7,7 +7,7 @@
     "productName": "Wave",
     "description": "Open-Source AI-Native Terminal Built for Seamless Workflows",
     "license": "Apache-2.0",
-    "version": "0.8.7-beta.1",
+    "version": "0.8.7",
     "homepage": "https://waveterm.dev",
     "build": {
         "appId": "dev.commandline.waveterm"