Replace the headscale-adapted routes golden files with authoritative
captures from Tailscale SaaS using the 12-node topology (8 original
grant nodes + 4 new route-specific nodes: ha-router1, ha-router2,
big-router, multi-router).
The golden data was captured via debug-packet-filter-rules from all
12 nodes. The routes driver now falls back to the standard 3-user
setup when topology.users is absent (matching the SaaS capture
format) and converts @passkey/@dalby.cc emails to @example.com.
92 test cases captured, all valid JSON, all from Tailscale SaaS.
Updates #2180
91aac1ceb2