[Feature]: Support for OpenCode v2

[CrescentKohana]

Is your feature request related to a problem?

The plugin fails on OpenCode v2.

Server plugin error
@devtheops/opencode-plugin-otel@1.5.1
Plugin must export a default definition with an id and an effect or setup function.
Reference: err_e3650d53

Describe the solution you'd like

Adding support for OpenCode v2.

Migration guide: https://opencode.ai/v2/docs/build/plugins/migrate-v1

Describe alternatives you've considered

No response

Telemetry type

No response

Additional context

No response

Checklist

• I have searched existing issues and discussions for similar feature requests
• I have checked the changelog to see if this already exists