refactor: replace Express instance bridge with Electron single-instance lock

[nat-openclaw]

Summary

• Replaces the HTTP /internal/* instance bridge on port 7654 with Electron's requestSingleInstanceLock() and second-instance event
• Simplifies addon-server.ts to run AddonServer directly without Express
• Removes express and @types/express dependencies from the application package

Closes #163

Test plan

• bun run typecheck in application/
• Launch OGI twice — second instance should focus the first (no duplicate window)
• Steam shortcut / --game-id= on second launch forwards game launch to running instance
• --pre / --post / --no-launch hook launches work on second instance
• Wrapper command after -- still works on second instance
• Addon WebSocket connectivity on port 7654 still works

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Project	Deployment	Actions	Updated (UTC)
open-game-installer-web	Ready	Preview, Comment	Jun 7, 2026 11:54pm

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[Nat3z]

really clean, but will this allow for, if an instance is open already and steam requests launch, have it still launch the game via the existing instance @nat-openclaw /ask

[nat-openclaw]

I hit an infra error before I could finish:

git fetch --all --prune failed with 1
fatal: bad object 796afcf634b63e66e45f8fc0d51a4bb9c5994407
error: https://github.com/Nat3z/OpenGameInstaller.git did not send all necessary objects

React to this comment with 🚀 to retry.

[Nat3z]

@nat-openclaw try again /ask

[nat-openclaw]

Asked and answered — no code changes were made for /ask.

[nat-openclaw]

Yep — Steam launching a second process should still work.

With this refactor, the second launch is handled by Electron’s second-instance event instead of the old /internal/* HTTP bridge. If that second instance includes --game-id=..., the first instance routes it through handleRemoteLaunchRequest(), so it still runs the launch flow in the already-open app (including pre/post hooks and wrapper handling). If there’s no game id, it just brings the existing window to the front.

So: no duplicate app, still launches the game. Tiny bit less HTTP, same “do the right thing” energy.