Add IStatusReporter for user feedback during long operations

[siewers]

Problem

Long-running operations like web authentication provide no feedback to the user. The auth flow happens inside NetatmoClient → WebSessionAuth, so commands don't know when it's occurring and can't show spinners or status messages.

Proposal

Introduce an IStatusReporter interface that components can call to report status:

public interface IStatusReporter
{
    void Report(string message);
}

• Pass it as a dependency to NetatmoClient and WebSessionAuth so both can report directly without relaying through each other
• Provide different implementations depending on execution context:
  • Interactive: Spectre.Console spinner/status display
  • Unattended (background service): simple log lines or no-op
• Detection could be automatic (Console.IsInputRedirected, Environment.UserInteractive) or explicitly set by the command

Scope

• Define IStatusReporter interface
• Implement interactive (Spectre) and unattended (plain text / no-op) variants
• Wire into NetatmoClient and WebSessionAuth
• Remove the login-specific spinner added in LoginCommand once this is in place