fix: split report global keys into raw and computed across plugins

The `<plugin>-global-<property>` keys in `:report` output returned the resolved value with the built-in default substituted in, so external tooling could not distinguish a property that had been set globally to the default from one that had never been set. The bare keys for caddy, haproxy, and traefik global-only properties had the same shape. The `global-<property>` keys now hold the raw stored value and are empty when nothing has been set, and a new `computed-<property>` key holds the effective value used at runtime, falling back through the per-app value (where one exists), the global value, and the built-in default. The bare global-only keys for the three proxy plugins are removed in favor of the raw/computed pair. Closes #8631.

tests/unit/network.bats

@@ -66,6 +66,47 @@ teardown() {
   assert_success
 }
 
+@test "(network:report) tld raw vs computed" {
+  run /bin/bash -c "dokku network:set --global tld"
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+
+  run /bin/bash -c "dokku --quiet network:report --global --format json | jq -r '.\"network-global-tld\"'"
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+  assert_output ""
+
+  run /bin/bash -c "dokku network:set --global tld example.test"
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+
+  run /bin/bash -c "dokku --quiet network:report --global --format json | jq -r '.\"network-global-tld\"'"
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+  assert_output "example.test"
+
+  run /bin/bash -c "dokku --quiet network:report $TEST_APP --format json | jq -r '.\"network-global-tld\"'"
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+  assert_output "example.test"
+
+  run /bin/bash -c "dokku --quiet network:report $TEST_APP --format json | jq -r '.\"network-computed-tld\"'"
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+  assert_output "example.test"
+
+  run /bin/bash -c "dokku network:set --global tld"
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+}
+
 @test "(network) network:set bind-all-interfaces" {
   run deploy_app
   echo "output: $output"