fix(installation): guard startup package-manager probes with timeout

[ymylive]

Fixes #11657

Summary

• Add a 5s timeout guard around package-manager detection commands in Installation.method()
• Log and continue when a probe times out/fails, instead of hanging startup
• Add the same timeout guard to npm config get registry in Installation.latest() with fallback to https://registry.npmjs.org

Why

On some Windows environments, internal npm commands can hang indefinitely when spawned by OpenCode during startup/version checks. That blocks CLI startup with no visible error. This change ensures those checks fail fast and degrade gracefully.

Scope

• packages/opencode/src/installation/index.ts only
• No behavior changes for successful probes

[github-actions]

The following comment was made by an LLM, it may be inaccurate:

Potential duplicate found:

• PR fix: Windows CLI and deep link issues (#11657, #11666, #11674) #11724: "fix: Windows CLI and deep link issues (Windows: opencode CLI hangs at startup when running internal npm list / npm config get registry #11657, [Windows] Opening with deep link duplicates projects #11666, [BUG]: (app): Clicking on overflowed tab on the right in the file view/review section does not scroll it into view #11674)"
  • fix: Windows CLI and deep link issues (#11657, #11666, #11674) #11724

Why it might be related: PR #11724 addresses issue #11657, which is the exact same issue referenced in the current PR #13287. Both are related to fixing Windows CLI startup issues. This could indicate an existing PR attempting to solve the same problem.