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

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]

Dockerfile

@@ -6,7 +6,7 @@
 # ========================================
 # 阶段1: 构建阶段
 # ========================================
-FROM node:20-alpine AS frontend-builder
+FROM node:25-alpine AS frontend-builder
 
 WORKDIR /app