fix: vehicle plan publish fails on boot

[naltatis]

fixes #26272
follow-up to #24423

Seems to be an issue when booting with db-configured vehicles. We changed publish behavior in #24423.

@andig I'm currently unable to create a reproducible failing test. Maybe race-condition. But we could merge this anyways.

[sourcery-ai]

Hey - I've left some high level feedback:

• If site.coordinator being nil is unexpected in normal operation, consider adding a debug or warning log in the nil case so it's easier to spot misconfigured startup sequences rather than silently skipping publication.
• You might also consider guarding the call to publishVehicles until after site.coordinator is initialized, which would avoid needing the nil check here and make the initialization sequence more explicit.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- If `site.coordinator` being `nil` is unexpected in normal operation, consider adding a debug or warning log in the `nil` case so it's easier to spot misconfigured startup sequences rather than silently skipping publication.
- You might also consider guarding the call to `publishVehicles` until after `site.coordinator` is initialized, which would avoid needing the `nil` check here and make the initialization sequence more explicit.

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[andig]

We should only merge when the root cause is clear. It isn‘t to me.

Maybe race-condition

What should be racy? Don‘t think guessing helps.