fix(package.json): correct Windows sqlite-vec package name + add linux-arm64

The optionalDependencies entry `sqlite-vec-win32-x64` does not exist on npm
(404). The correct package name is `sqlite-vec-windows-x64` — the sqlite-vec
project maps Node's `process.platform` value `win32` to `windows` in its
`platformPackageName()` function.

Also adds the missing `sqlite-vec-linux-arm64` entry to match all 5 platforms
declared in sqlite-vec's own optionalDependencies.

Fixes #224

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

package.json

@@ -49,8 +49,9 @@
   "optionalDependencies": {
     "sqlite-vec-darwin-arm64": "^0.1.7-alpha.2",
     "sqlite-vec-darwin-x64": "^0.1.7-alpha.2",
+    "sqlite-vec-linux-arm64": "^0.1.7-alpha.2",
     "sqlite-vec-linux-x64": "^0.1.7-alpha.2",
-    "sqlite-vec-win32-x64": "^0.1.7-alpha.2"
+    "sqlite-vec-windows-x64": "^0.1.7-alpha.2"
   },
   "devDependencies": {
     "@types/better-sqlite3": "^7.6.0",