chore(deps): bump node in /infra/docker/local/management-web-sidecar

Bumps node from 24-slim to 26-slim.

---
updated-dependencies:
- dependency-name: node
  dependency-version: 26-slim
  dependency-type: direct:production
...

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

Author: dependabot[bot]

infra/docker/local/management-web-sidecar/Dockerfile

@@ -1,5 +1,5 @@
 # Metaboost Management Web sidecar – runtime-config server (build from repo root)
-FROM node:24-slim
+FROM node:26-slim
 
 WORKDIR /app