build: approve better-sqlite3 install script (npm install-scripts policy)

npm >=11 on node 24 skips non-approved dependency install scripts, so fresh
clones/worktrees never build the better-sqlite3 native bindings and every
build fails with "Could not locate the bindings file". Approving it in
package.json makes the approval travel with the repo.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

package.json

@@ -38,5 +38,8 @@
     "node-fetch": "^3.3.2",
     "web-push": "^3.6.7",
     "youtube-transcript": "^1.3.1"
+  },
+  "allowScripts": {
+    "better-sqlite3@12.9.0": true
   }
 }