fix(electron): unpack sqlite-vec native extension for packaged builds

sqlite-vec loads its native .dylib/.dll/.so via require.resolve(), which
in a packaged Electron app resolves to a path inside app.asar where native
extensions cannot be loaded. Adds sqlite-vec* to asarUnpack so the extension
lands in app.asar.unpacked and require.resolve() returns the correct path.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/desktop/electron-builder.yml

@@ -26,6 +26,7 @@ files:
 # 哪些文件将不会被压缩，而是解压到构建目录
 asarUnpack:
   - resources/**
+  - node_modules/sqlite-vec*/**
 
 # Windows 平台配置
 win: