[Marc-André Moreau (mamoreau-devolutions)]

Summary

package update-all and package update-manager only worked when the desktop window was open: the IPC server relied on the window's OnUpgradeAll / OnUpgradeAllForManager events, so a --headless session answered "The current UniGetUI session cannot update all packages."

• The two events are replaced by IpcServer.UpdateAllHandler, which returns the operations it queued. The desktop app still queues updates through its window, so they show in its operations list.
• Without a handler (headless), the server queues the updates itself through IpcPackageApi.QueueAllUpdatesAsync. It reads only the update loader's list, never the managers' raw lists, so ignored updates, skipped minor updates and the minimum update age still apply. Packages that already have an update queued or running are skipped.
• Both modes return an IpcPackageBulkOperationResult listing the queued operation ids, which operation wait can follow.
• CLI: update-all accepts --manager, and both commands accept --wait true, --timeout (default 3600) and --delay. The wait runs in the CLI, which polls the operations list, so it isn't bound by the 5-minute request timeout. It exits with 1 if any update fails or the wait times out. Note that a failed single package update still exits 0; the non-zero exit is new and limited to --wait.
• An unknown --manager is now rejected with HTTP 400 instead of silently queueing nothing.
• docs/CLI.md and docs/IPC.md are updated, including a new "Updating everything" section.

Testing

• dotnet test on the IPC tests: 56 passed, including 7 new ones in IpcBulkUpdateTests (CLI parsing, JSON source-gen round trip, queued result shape, wait result mapping).
• Started a real --headless daemon over TCP and ran package update-manager --manager bun (disabled there, so nothing could be installed) with and without --wait true: queuedCount: 0, exit code 0. An unknown manager returned a clear error with exit code 2. A real update-all was not run, to avoid updating software on the test machine.
• dotnet format whitespace --verify-no-changes passes. dotnet format style --verify-no-changes reports only an existing IDE0060 in CargoManagedOperationRoutingTests.cs, which this PR doesn't touch.
• NativeAOT publish was not run. The new payload type is registered in IpcJsonContext, and no reflection is added.

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