Add OpenSearch and SearchPage functionality for DuckDuckGo

Introduced the `OpenSearch` method and `SearchPage` interface to streamline search operations and allow for loading more results dynamically. Updated dependencies and modified the DuckDuckGo CLI to utilize these enhancements.

sites/duckduckgo/cmd/duckduckgo/main.go

@@ -3,11 +3,11 @@ package main
 import (
 	"context"
 	"fmt"
+	"github.com/urfave/cli/v3"
 	"io"
 	"os"
 	"strings"
-
-	"github.com/urfave/cli/v3"
+	"time"
 
 	"gitea.stevedudenhoeffer.com/steve/go-extractor/cmd/browser/pkg/browser"
 	"gitea.stevedudenhoeffer.com/steve/go-extractor/sites/duckduckgo"
@@ -58,6 +58,7 @@ func deferClose(cl io.Closer) {
 func main() {
 	var flags []cli.Flag
 
+	flags = append(flags, browser.Flags...)
 	flags = append(flags, Flags...)
 
 	cli := &cli.Command{
@@ -81,13 +82,24 @@ func main() {
 				return fmt.Errorf("failed to create browser: %w", err)
 			}
 
-			res, err := c.Search(ctx, b, query)
-
+			search, err := c.OpenSearch(ctx, b, query)
 			if err != nil {
-				return fmt.Errorf("failed to search: %w", err)
+				return fmt.Errorf("failed to open search: %w", err)
 			}
 
-			fmt.Println(res)
+			defer deferClose(search)
+
+			res := search.GetResults()
+			fmt.Println("Results:", res)
+
+			err = search.LoadMore()
+			if err != nil {
+				return fmt.Errorf("failed to load more: %w", err)
+			}
+
+			time.Sleep(2 * time.Second)
+			res = search.GetResults()
+			fmt.Println("Results:", res)
 
 			return nil
 		},