feat: add Google engine using GSA User-Agent scraping

SearXNG approach: use Google Search Appliance (GSA) User-Agent
pool — these are whitelisted enterprise identifiers Google trusts.

Key techniques:
- GSA User-Agent (iPhone OS + GSA/ version) instead of Chrome desktop
- CONSENT=YES+ cookie to bypass EU consent wall
- Parse /url?q= redirector URLs (unquote + strip &sa= params)
- div.MjjYud class for result containers (SearXNG selector)
- data-sncf divs for snippets
- detect sorry.google.com blocks
- Suggestions from ouy7Mc class cards

internal/engines/factory.go

@@ -31,6 +31,7 @@ func NewDefaultPortedEngines(client *http.Client) map[string]Engine {
 		"duckduckgo": &DuckDuckGoEngine{client: client},
 		"github":     &GitHubEngine{client: client},
 		"reddit":     &RedditEngine{client: client},
-		"bing":       &BingEngine{client: client},
+		"bing":   &BingEngine{client: client},
+		"google": &GoogleEngine{client: client},
 	}
 }