feat(FR-2887): serve released bundle via Portless with version-named URL

[yomybaby]

Resolves #7397 (FR-2887)

Summary

Adds a new "serve a released bundle locally via Portless" workflow so QA, developers, and reviewers can spin up any published backend.ai-webui release under a stable, version-named URL.

• scripts/serve-release.sh
  • Wraps serve in portless after extraction; the proxied URL is derived from the version (e.g. 26.4.8-rc.3 → https://v26-4-8-rc-3.localhost:1355).
  • Reuses the project's existing Portless daemon port (1355, same default as scripts/dev.mjs); honours PORTLESS_PORT if the caller pinned one.
  • Adds SERVE_PORT env var (default 9091) so multiple releases can be served side-by-side.
  • Falls back to plain serve on http://localhost:${SERVE_PORT} when portless isn't installed — no behavioural regression for lean environments.
• .claude/skills/serve-release/
  • New Claude Code skill that teaches the assistant when and how to invoke the script.
  • Mirrors the structure of the existing dev-server skill (version resolution, pre-flight checks, port selection, URL announcement, common follow-ups, out-of-scope).
  • Trigger phrases cover Korean and English ("릴리즈 띄워", "serve release", "특정 버전 띄워줘", etc.).

Why

Previously, scripts/serve-release.sh served every release on http://localhost:9091. When comparing releases side-by-side (e.g. rc.2 vs rc.3) the URL gave no hint which version was loaded, and cookies/storage clashed across runs. The dev-server flow already standardises on Portless for the same reason — this change brings the release-serve flow in line.

Test plan

• ./scripts/serve-release.sh v26.4.8-rc.3 downloads the bundle, copies config.toml, and prints both the Portless URL (https://v26-4-8-rc-3.localhost:1355) and the direct fallback URL.
• Browsing the Portless URL serves the WebUI; cookies/storage are isolated from a concurrently-running pnpm dev.
• SERVE_PORT=9092 ./scripts/serve-release.sh v26.4.7 runs in parallel without clashing with 9091 and uses https://v26-4-7.localhost:1355.
• Cached extraction: rerunning the script with the same version reuses scripts/temp-releases/webui-<VERSION>/ and skips download.
• No-portless fallback: temporarily renaming the portless binary out of $PATH makes the script serve via http://localhost:9091 directly without erroring.
• Claude Code recognizes the new skill: invoking with "v26.4.7 띄워줘" picks serve-release, not dev-server.

[yomybaby]

• feat(FR-2887): serve released bundle via Portless with version-named URL #7398 👈 (View in Graphite)
• main

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Status	Category	Percentage	Covered / Total
🔵	Lines	4.77%	28 / 586
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[Copilot]

Pull request overview

Adds a workflow for serving any published backend.ai-webui release bundle locally under a stable, version-named Portless URL (with a plain-serve fallback), and documents/automates the workflow via a new Claude Code skill.

Changes:

• Update scripts/serve-release.sh to derive a version-based Portless app name, support SERVE_PORT, and fall back to direct serve when portless is unavailable.
• Start (or reuse) the Portless proxy daemon on the standard project port (default 1355, respecting PORTLESS_PORT when set).
• Add .claude/skills/serve-release/ to guide invoking the script and announcing Portless/direct URLs.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
scripts/serve-release.sh	Adds Portless-based serving with version-derived subdomain, configurable serve port, and non-Portless fallback.
.claude/skills/serve-release/SKILL.md	Introduces a Claude Code skill documenting version resolution, preflight checks, and how to run the release-serve script.

[yomybaby]

Code review

No issues found. Checked for bugs and CLAUDE.md compliance.

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