feat(packaging): offer one elevated firewall step instead of two dialogs

Installing used to mean clicking through two separate Windows "Allow
access" prompts later — one for MeshBay.exe, one for meshbay-node.exe —
each confusing on its own and worse before the exe carried a version
resource. Adding a firewall rule needs admin, and the installer is
deliberately per-user with no elevation, so this can only ever be opt-in.

packaging/win/firewall.ps1 (new, shipped as an extraResource at
resources\firewall.ps1): idempotent add/remove of the two inbound UDP
rules ("MeshBay", "MeshBay Node"), grouped, logged to
%TEMP%\meshbay-firewall.log. Locates both executables from its own path,
no arguments needed beyond the action.

build/installer.nsh: customInstall asks "Allow MeshBay through Windows
Firewall now?" and runs firewall.ps1 via NSIS ExecShellWait "runas" — one
UAC prompt — only when not ${Silent}; declining or dismissing UAC falls
back to Windows' own per-process prompts, unchanged. customUnInstall
offers the same in reverse, defaulted to No (a stale rule for a deleted
exe is inert, so this should not nag on the way out) and skipped for a
silent uninstall.

Verified: rebuilt MeshBay-Setup-0.1.0.exe (electron-builder compiles the
new LogicLib.nsh / ExecShellWait NSIS successfully); firewall.ps1 run
unelevated fails cleanly into its log ("Access is denied") rather than
silently doing nothing, confirming the fallback path. Node suite 835
pass / 25 skip.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

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