docs: specify exact version in plugin installation instructions

[devxoul]

Summary

• Improves OpenCode startup time by instructing users to install with exact version (e.g., [email protected]) instead of unversioned package name
• Updates installation scripts to automatically fetch latest version from npm before installation
• Applied to all three README files (EN, KO, JA)

Why

Without version specification, npm/bun checks the registry for the latest version on every OpenCode launch, causing slower startup times.

[code-yeongyu]

By the approach you took the auto update would be disabled forever I think?

[code-yeongyu]

Without version specification, npm/bun checks the registry for the latest version on every OpenCode launch, causing slower startup times.

Is that actually true? Because I thought there might be small delay but not huge

[devxoul]

Is that actually true? Because I thought there might be small delay but not huge

Yeah, you may check the source code at plugin/index.ts:37-40:

const lastAtIndex = plugin.lastIndexOf("@")
const pkg = lastAtIndex > 0 ? plugin.substring(0, lastAtIndex) : plugin
const version = lastAtIndex > 0 ? plugin.substring(lastAtIndex + 1) : "latest"
plugin = await BunProc.install(pkg, version)

This will execute bun install with @latest which will always check for the latest version of each plugins. No cache will be used.

By the approach you took the auto update would be disabled forever I think?

You can still add some background job to check if there's latest version exists.

[code-yeongyu]

Looks nice but currently by merging this It'll break the auto update- so I'll merge this after background update feature is implemented (soon)