Fix package.json/lockfile mismatch for better-sqlite3

package.json pinned 9.6.0 but package-lock.json had 13.0.3,
causing npm ci to fail immediately. Updated to ^13.0.3 to match
what is already resolved in the lockfile.

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

package.json

@@ -22,7 +22,7 @@
   "license": "MIT",
   "dependencies": {
     "axios": "^1.6.2",
-    "better-sqlite3": "9.6.0",
+    "better-sqlite3": "^13.0.3",
     "cors": "^2.8.5",
     "dotenv": "^16.3.1",
     "express": "^4.18.2",