Make replay a service in preparation for consolidating with search & scrollback

[hloeung]

Move the replay code as is with minimal changes making it a service similar to search & scrollback.

This is in preparation for cleaning up and consolidating the code between the three to reduce duplicate code and so they're consistent. See also #553 for work on making search consistent.

[NightTsarina]

Merging this created an unexpected problem for me: I cannot join private channels any more

[hloeung]

Merging this created an unexpected problem for me: I cannot join private channels any more

Is it because of this change or stock 0.28.0 per #578?

[NightTsarina]

Merging this created an unexpected problem for me: I cannot join private channels any more

Is it because of this change or stock 0.28.0 per #578?

I am using current master branch, with a few of your PRs on top. This bug appears only when I apply this change. See b823f51 vs 37d8c1a

[hloeung]

@copilot resolve the merge conflicts in this pull request

[Copilot]

Pull request overview

This PR refactors the existing “replay unseen messages” logic by moving it out of userbridge.go into service.go as a first-class service command (REPLAY), aligning it structurally with search and scrollback in preparation for future consolidation work.

Changes:

• Moved the replay implementation into mm-go-irckit/service.go and registered it as the replay service command.
• Simplified addUserToChannelWorker by delegating replay behavior to the new service handler.
• Adjusted channel syncing behavior so non-DM channels are synced explicitly in the worker before replay.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 4 comments.

File	Description
mm-go-irckit/userbridge.go	Replaces the inline replay logic in the channel-join worker with a call into the new replay service handler and adjusts when syncChannel is invoked.
mm-go-irckit/service.go	Introduces a new replay service command by transplanting the previous replay logic into the service command layer and wiring it into the command map.

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