feat(vgw): add virtual network gateway forced tunneling add-on #1246
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Adds S2S VPN gateway add-on with forced tunneling through Azure Firewall. Key items: active-active VNet gateway (VpnGw2), local network gateway + IPsec connection, static route tables (vgw + hub overrides) enforcing firewall inspection, peerings updated for gateway transit, default VGW-OnPrem firewall rule group (override via customFirewallRuleCollectionGroups). Refactor replaces monolithic retrieve-existing.bicep with firewall-info, vnet-info, subnet-info, collect-spoke-addresses modules; removes BCP318 warnings. Expanded README: routing rationale, security, operations, custom rule examples (HTTPS only, deny-before-allow). Validation: successful what-if + deployment in usgovvirginia; expected resources present. Fixes #1235.