fix: move pino-pretty to production dependencies

pino-pretty is used at runtime via the exported options transport config
in server/plugin.js, so it must be available in production installs.

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

Author: fey

package-lock.json

@@ -19,15 +19,15 @@
     "fastify": "^5.8.5",
     "fastify-cli": "^8.0.0",
     "lodash": "^4.18.1",
+    "pino-pretty": "^13.1.3",
     "pug": "^3.0.4",
     "@sentry/node": "^10.53.1"
   },
   "devDependencies": {
     "@biomejs/biome": "^2.4.15",
     "jest": "^30.4.2",
     "npm-check-updates": "^22.2.0",
-    "pino": "^10.3.1",
-    "pino-pretty": "^13.1.3"
+    "pino": "^10.3.1"
   },
   "engines": {
     "node": ">=20.x"