fix(setup): skip local-browser precondition for every remote target

The pre-flight check only skipped isBrowserRunning() when BU_CDP_HTTP was
set, so a machine with no local browser failed /browser-setup with 'No
browser instance running' before discovery ever dialed the built-in
castle default. Resolve the target the same way discovery does and skip
the local-process check whenever it resolves remote — env var,
/browser-target choice, or default. A resolved local target still
requires a local browser, and an unreachable remote still fails loudly
in step 4.

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