Add token expiry, edit notice, log allowlist, local-zone test; merge PLAN.md into SPECS.md

get_logs needs a unit from an allowlist (router-*, kea, unbound, networkd,
nftables, ddclient, acme, sshd, kernel). API tokens are valid for 1, 7, 30
(default) or 90 days, or without limit. The overview and the Changes page
say which token made the unapplied changes.

options.json (router://options) no longer holds the options' source paths:
they differ between builds of a release, so a router rebuilding itself
offline had to build the file and failed (found by the update test).

Web UI: panels flow into columns on wide screens and the width is no longer
capped; on phones the navigation is a menu button; the Advanced page uses
panels; VLAN dropdowns show their chosen names; the duplicate WireGuard
heading is gone.

basic: a subtest for wan -> local rules.

SPECS.md is now the only document (decisions, how each part works, and what
is not done yet); PLAN.md is gone.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AeFqV9dZrK6nipHkPfyM4F

pkgs/router-webui/interfaces_test.go

@@ -129,3 +129,12 @@ func TestRenameVLAN(t *testing.T) {
 		t.Error("a card and a VLAN with the same name")
 	}
 }
+
+func TestDevLabel(t *testing.T) {
+	devs := []Device{{Name: "lan.30", Kind: "VLAN", Custom: "cams"}, {Name: "lan.40", Kind: "VLAN"}, {Name: "lan", Kind: "physical"}}
+	for name, want := range map[string]string{"lan.30": "cams (lan.30)", "lan.40": "lan.40", "lan": "lan", "other": "other"} {
+		if got := devLabel(devs, name); got != want {
+			t.Errorf("%s: %q, want %q", name, got, want)
+		}
+	}
+}