Add documentation for DisableBackgroundServices configuration option

[Copilot]

Documents the DisableBackgroundServices() feature from Arcenox-co/TickerQ#413, which enables queue-only mode for scenarios where job processing is handled by separate worker instances.

Changes

• New page: docs/api-reference/configuration/core-configuration/background-services.md
  • Method signature and usage
  • Queue-only mode behavior
  • Use cases: API-only servers, microservices, testing
  • Dispatcher/scheduler behavior when disabled
• Updated: Core configuration index pages and sidebar navigation

Usage

builder.Services.AddTickerQ<TTimeTicker, TCronTicker>(options =>
{
    // Queue jobs without processing - let worker nodes handle execution
    options.DisableBackgroundServices();
});

Screenshot

Original prompt

Create a new branch
Then work on adding information to the documentation about the changes in this PR:

Arcenox-co/TickerQ#413

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