fix: disable oauth notification monitor when endpoint is unavailable

[Pnkcaht]

What I did

• Added a one-time availability check before starting the OAuth notification monitor.
• If the endpoint is unavailable, the monitor does not start and logs only once.
• Normal behavior is preserved on Docker Desktop.

Related Issue

• Fixes Connecting to OAuth notification error SPAM IN TERMINAL #245

Diagram

flowchart TD
    A[Start OAuth Monitor] --> B{Endpoint available?}
    B -- Yes --> C[Start monitor goroutine]
    B -- No --> D[Disable monitor, log once]
    C --> E[Connect to OAuth SSE stream]
    E --> F[Process events]
    D --> G[No goroutine, no spam]

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