chore(deps): bump node from 20-alpine to 25-alpine in /frontend

Bumps node from 20-alpine to 25-alpine.

---
updated-dependencies:
- dependency-name: node
  dependency-version: 25-alpine
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

frontend/Dockerfile

@@ -1,5 +1,5 @@
 # Frontend Dockerfile
-FROM node:20-alpine
+FROM node:25-alpine
 
 WORKDIR /app