docs(skill): refine release-manager guidance from the v1.3.0 release

[fengmk2]

Fold the v1.3.0 release lessons into the release-manager skill.

• Changelog structure: drop the separate Highlights section. Headline capabilities and security fixes lead Features, and the upstream upgrade entry stays last. The Discord format keeps its Highlights block.
• Release notes: add a fixed "Create a New App" section after Installation with the pnpm create vite-plus example.
• Advisories: cite only published advisories. A draft advisory visible through maintainer access is still embargoed, so it stays out of the notes and the announcement.
• RustSec failures: check open Renovate PRs before opening a fix, since one may already bump the crate.
• First publish of a new npm package: confirm the package has a trusted publisher for release.yml and the release environment before merging. Without it, the publish fails with ERR_PNPM_AUTH_TOKEN_EXCHANGE ... (status code 404) after vite-plus is already on latest, and the GitHub release, Docker image, docs deployment, and Discord notification are skipped.
• Partial Release failures: use "Re-run failed jobs", never "Re-run all jobs". A full rerun repeats check, which then sees the new version on latest and skips the release. Publishing is idempotent, so a failed-jobs rerun uploads only what is missing. Whoever starts the rerun cannot approve it.
• Post-release checks: use --prefer-online when a fresh version reports ETARGET locally. pnpm 11 and later default to a one-day minimumReleaseAge, so pnpm create vite-plus resolves to the previous create-vite-plus for a day after publishing.

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