Fix docker scaling and show loading MOTD

[Lenart12]

Fixes:

• Fixed Server autoscales down when waking player maintains initial connection #525 that was a regression by Allow mc-router to scale a backend StatefulSet while routing traffic to a proxy via proxyServerName #512.
• Does not show 'Can't connect to server' during the time that the server is waking up
• Correctly handle new player connections that occur while the server is waking up
• Show asleep motd instantly when a server is finished downscaling

Also included in this PR is a new configuration option for docker containers --auto-scale-loading-motd which will enable configuring showing a specific motd when a server is loading, if not configured it will fallback to the asleep-motd behaviour.

[Copilot]

Pull request overview

This PR adds support for displaying a loading MOTD while Docker containers are waking up, and fixes a regression introduced in PR #512 where servers would auto-scale down even when a player was connected. The fix ensures that container monitoring is refreshed after scaling operations to maintain route consistency.

Changes:

• Added LoadingMOTD configuration option for Docker auto-scaling to show a specific message while servers are waking up
• Fixed Docker sleeper to call monitorContainers after stopping a container, ensuring routes are refreshed
• Added wake tracking infrastructure to distinguish between asleep and loading states

Reviewed changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
server/connector.go	Added wake tracking with wakingServers, loading MOTD support, and logic to show loading state during wake operations
server/routes.go	Added loadingMOTD field to mapping struct and GetLoadingMOTD method
server/docker.go	Added loading MOTD label support and sleeper now calls monitorContainers to refresh routes after stopping
server/k8s.go	Updated function signatures to include empty loading MOTD parameters
server/configs.go	Added LoadingMOTD field to AutoScale configuration
server/routes_test.go	Added test for loading MOTD functionality
server/connector_test.go	Added tests for wake tracking and loading MOTD retrieval
server/k8s_test.go	Updated mock expectations to include loading MOTD parameter
server/routes_config_loader.go	Updated function calls to include empty loading MOTD parameter
server/api_server.go	Updated function calls to include empty loading MOTD parameters
server/docker_swarm.go	Updated function calls to include empty loading MOTD parameters
server/server.go	Added call to configure loading MOTD on connector
README.md	Documented new loading MOTD configuration option

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[Lenart12]

This is ready for intelligent review...