feat(11-01): add GoogleDorkSource and BingDorkSource with formatQuery updates

- GoogleDorkSource uses Google Custom Search JSON API (APIKey+CX required)
- BingDorkSource uses Bing Web Search API v7 (Ocp-Apim-Subscription-Key header)
- formatQuery now handles google/bing/duckduckgo/yandex/brave dork syntax
- Both sources follow established pattern: retry via Client, rate limit via LimiterRegistry

pkg/recon/sources/queries.go

@@ -47,6 +47,8 @@ func formatQuery(source, keyword string) string {
 	switch source {
 	case "github", "gist":
 		return fmt.Sprintf("%q in:file", keyword)
+	case "google", "bing", "duckduckgo", "yandex", "brave":
+		return fmt.Sprintf(`site:pastebin.com OR site:github.com "%s"`, keyword)
 	default:
 		// GitLab, Bitbucket, Codeberg, HuggingFace, Kaggle, Replit,
 		// CodeSandbox, sandboxes, and unknown sources use bare keywords.