ci: wire up changesets release/publish workflows for go-web

[Dugyu]

Summary

This PR adapts the Changesets release/publish workflows copied from a monorepo to fit this repository (single package + example / example-rspress). It also clarifies CI vs release vs publish execution so regular PRs and regular main pushes won’t accidentally trigger publishing.

What changed

• workflow-test.yml: reworked into a repo-specific dedicated test workflow (pnpm typecheck + build example + build example-rspress) to be reused by other workflows.
• ci.yml: runs only on PRs and reuses workflow-test.yml (no extra write permissions needed).
• release-pr.yml: on main pushes, runs changesets/action to create/update the release PR.
• publish.yml:
  • runs the dedicated tests before any publish attempt
  • keeps detect-version-packages gating so publishing only happens when merging a changeset-release/* PR
  • sets id-token: write + NPM_CONFIG_PROVENANCE to prepare for OIDC/Trusted Publishing (no NODE_AUTH_TOKEN required).
• ci-setup composite action: adds registry-url and a package-manager-cache toggle so publish can opt into a clean, no-cache install while CI stays cached by default.

Verification

• Ran locally: pnpm typecheck

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