Use Node 24 LTS instead of Node 25 (non-LTS) in Dockerfile

[Copilot]

Node 25 is an odd-numbered "Current" release with a short support window, making it unsuitable as a production base image. Node 24 is the Active LTS line.

Changes

• Dockerfile: Bump all three multi-stage build stages (deps, builder, runner) from node:25-alpine → node:24-alpine

# Before
FROM node:25-alpine AS deps
FROM node:25-alpine AS builder
FROM node:25-alpine AS runner

# After
FROM node:24-alpine AS deps
FROM node:24-alpine AS builder
FROM node:24-alpine AS runner

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[Copilot]

Pull request overview

Updates the Docker build to use the Active LTS Node.js line (24) instead of the short-lived “Current” line (25), improving production stability and support lifecycle alignment for the container image.

Changes:

• Switched the deps stage base image from node:25-alpine to node:24-alpine
• Switched the builder stage base image from node:25-alpine to node:24-alpine
• Switched the runner stage base image from node:25-alpine to node:24-alpine

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