chore(deps): bump node from 18-alpine to 26-alpine

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Bumps node from 18-alpine to 26-alpine.

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Project	Deployment	Actions	Updated (UTC)
fusiontik	Ready	Preview, Comment	May 11, 2026 2:21am

[ghost]

Rooviewer   See task

This PR jumps from Node 18-alpine to 26-alpine, skipping three major versions. Two concerns worth addressing before merging:

• Node 26 is not LTS. It is a "Current" release and won't enter LTS until ~October 2027. Consider targeting node:22-alpine or node:24-alpine for production stability.
• Verify corepack enable pnpm still works. Corepack's bundling status has been evolving across Node versions. If it is no longer bundled in Node 26, the Docker build will fail at RUN corepack enable pnpm (lines 12 and 44). May need npm install -g corepack as a prerequisite.

_{Mention @roomote in a comment to request specific changes to this pull request or fix all unresolved issues.}

[ghost]

Node 26 is a "Current" release, not LTS. It won't enter LTS until around October 2027. For a production Docker image, using a non-LTS version means shorter support windows and higher risk of instability. The jump from 18 directly to 26 also skips three major versions (20, 22, 24), which compounds the risk of breaking changes in native modules, APIs, or dependency compatibility. Consider targeting node:22-alpine or node:24-alpine (both LTS) instead.

Suggested change

	FROM node:26-alpine AS deps
	FROM node:22-alpine AS deps

_{Fix it with Roo Code or mention @roomote and request a fix.}