[Suggestion] Remove deprecated OpenCode v1 support #50

Is your feature request related to a problem? Please describe?

The v2 migration will retain deprecated v1 entrypoints or adapters for a transition period so current OpenCode v1 users are not broken. Once v2 adoption is established, the legacy implementation should be removed.

Describe the solution you'd like

Remove the deprecated v1 server/TUI entrypoints, compatibility wiring, v1-only dependencies, legacy SQLite/configuration fallbacks where no longer needed, and v1 documentation from model-usage. Keep the v2 implementation as the only supported path.

This should be handled after the v2 migration in #47 and coordinated with wlib and persona-injector.

Describe alternatives you've considered

Keeping both APIs indefinitely would preserve compatibility but increase maintenance and data-layer complexity.

Additional context

Coordinate removal with:

• [Suggestion] Prepare opencode-wlib for OpenCode v2 plugin API opencode-wlib#4
• [Suggestion] Migrate Persona Injector to OpenCode 2 (V2) opencode-persona-injector#34

Media

N/A