feat(packaging): cover LAN casting in the Windows firewall step, too

firewall.ps1 only handled WebRTC. The cast HTTP relay (src/cast-relay.js,
fixed TCP 19550-19553) and Chromecast/Smart TV mDNS discovery
(src/cast-chromecast.js, bonjour-service, UDP 5353) are a separate surface
on the client and were still hitting Windows' own "Allow access" dialog.

Now four named rules: MeshBay / MeshBay Node stay program-scoped with no
port restriction (there is no fixed WebRTC port to name -- the Windows
equivalent of the broad 1024-65535/udp range the Linux packaging needs,
since netfilter has no program scoping); MeshBay Cast / MeshBay Cast
Discovery add the program AND the fixed port, matching
packaging/firewall/*/meshbay-cast.xml exactly.

test_packaging_win.py cross-checks the port numbers against cast-relay.js's
own constants and the Linux firewalld definition, so the three descriptions
of one port range can't quietly drift apart.

Verified: rebuilt MeshBay-Setup-0.1.0.exe; the deployed firewall.ps1 carries
all four rules. Node suite 836 pass / 25 skip.

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

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