[Feature] Simplify LLM provider setup with OmniRoute integration #40505

Problem

Setting up different LLM providers in OpenCode currently requires manual configuration. This is inconvenient and can be complex, especially when managing multiple providers or wanting to use advanced routing features.

Proposed Solution

Integrate OmniRoute to manage LLM providers. This would allow OpenCode to automatically discover, configure, and route requests to various LLMs through OmniRoute. The goal is to simplify the setup process and enable features like smart routing and unified metrics without manual intervention.

Benefits

• Easier Setup: Significantly simplifies adding and managing LLM providers.
• Automatic Provider Management: Reduces manual configuration steps.
• Smart Routing: Leverages OmniRoute's intelligent selection of LLMs.
• Centralized Metrics: Provides unified insights into LLM usage.

Acceptance Criteria

• OpenCode can use OmniRoute to discover and configure LLM providers automatically.
• Users experience a simpler process for adding new LLM providers.
• Basic smart routing functionality is available through OmniRoute.
• Usage metrics related to LLMs are accessible via OmniRoute's capabilities.