Connect OpenCode to Shorty

Add Shorty to `opencode.json` as a remote MCP server.

1. Project configopencode.json

{
    "mcp": {
        "shorty": {
            "type": "remote",
            "url": "https://aishorty.com/api/mcp",
            "enabled": true
        }
    }
}

Verify it worked

Call the MCP tool `get_usage_quota` (or `curl -s https://aishorty.com/v1/usage -H "Authorization: Bearer $SHORTY_API_KEY"` for the REST API)

Success: A JSON body naming a plan (Free, Premium, or Pro) and usage limits — not a 401 or a tool-not-found error.