refactor: move http api to a new transport layer

internal/transport/dns/client.go

@@ -0,0 +1,20 @@
+package dns
+
+import (
+	"git.wzray.com/homelab/hivemind/internal/transport"
+	"git.wzray.com/homelab/hivemind/internal/types"
+)
+
+type Client struct {
+	caller transport.Caller
+}
+
+func New(caller transport.Caller) *Client {
+	return &Client{
+		caller: caller,
+	}
+}
+
+func (c *Client) Callback(endpoint string, state types.HostState) (bool, error) {
+	return callbackRoute.Call(c.caller, endpoint, state)
+}