Deps: bump better-sqlite3 to ^11 (Node 18-24 prebuilds), drop unused auth deps

bcrypt, jsonwebtoken, express-validator, express-rate-limit were never imported.
better-sqlite3 9.x fails to compile on Node >=22.

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

package.json

@@ -17,13 +17,9 @@
   "dependencies": {
     "express": "^4.18.2",
     "cors": "^2.8.5",
-    "better-sqlite3": "^9.4.3",
+    "better-sqlite3": "^11.10.0",
     "multer": "^1.4.5-lts.1",
-    "bcrypt": "^5.1.1",
-    "jsonwebtoken": "^9.0.2",
-    "express-validator": "^7.0.1",
     "helmet": "^7.1.0",
-    "express-rate-limit": "^7.1.5",
     "dotenv": "^16.4.5"
   },
   "devDependencies": {