Function install 

pub async fn install(
    server_id: &str,
    name: Option<&str>,
    scope: &str,
    transport_override: Option<&str>,
    command_override: Option<&str>,
    args_override: Option<Vec<String>>,
    url_override: Option<&str>,
    env_vars: HashMap<String, String>,
) -> Result<McpManagerOutput, AppError>

Install a server into .mcp.json by looking it up in the registry and deriving the best config entry automatically.

Parameters (from args JSON)

• server_id – registry server name (e.g. "io.github.org/repo")
• name – local alias in .mcp.json (defaults to last path segment of server_id)
• scope – "user" | "project" (default "project")
• transport – override transport: "stdio" | "http" (auto-detected if omitted)
• command – override launch command (stdio only)
• args – override args array (stdio only)
• url – override URL (http only)
• env – map of env var name → value