Refactor DNS and SMTP configurations; add system DNS management

- Updated DNS server address configuration to use BindAddress and DnsPort.
- Enhanced email submission to utilize BindAddress for SMTP server address.
- Improved error messages for unknown recipient domains.
- Introduced a new OrderedMap structure for route management.
- Added system DNS management functions for Linux, Darwin, and Windows platforms.
- Created new dashboard services for DNS configuration and overview.
- Updated UI to include Proxy Rules section and improved descriptions.
- Added new utility functions for handling DNS configurations.

1 files changed, 37 insertions, 0 deletions

diff --git a/utils/collections/orderedmap.go b/utils/collections/orderedmap.go
new file mode 100644
index 0000000..b9f17b7
--- /dev/null
+++ b/utils/collections/orderedmap.go
@@ -0,0 +1,37 @@
+package collections
+
+type OrderedMap[K comparable, V any] struct {
+	keys   []K
+	values map[K]V
+}
+
+func OrderedMapOf[K comparable, V any]() OrderedMap[K, V] {
+	return OrderedMap[K, V]{
+		keys:   make([]K, 0),
+		values: make(map[K]V),
+	}
+}
+
+func (orderedMap *OrderedMap[K, V]) Set(key K, value V) {
+	if _, exists := orderedMap.values[key]; !exists {
+		orderedMap.keys = append(orderedMap.keys, key)
+	}
+	orderedMap.values[key] = value
+}
+
+func (orderedMap *OrderedMap[K, V]) Get(key K) (V, bool) {
+	value, exists := orderedMap.values[key]
+	return value, exists
+}
+
+func (orderedMap *OrderedMap[K, V]) All() []V {
+	result := make([]V, 0, len(orderedMap.keys))
+	for _, key := range orderedMap.keys {
+		result = append(result, orderedMap.values[key])
+	}
+	return result
+}
+
+func (orderedMap *OrderedMap[K, V]) Len() int {
+	return len(orderedMap.keys)
+}