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/bing_test.go

@@ -0,0 +1,146 @@
+package sources
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"sync/atomic"
+	"testing"
+	"time"
+
+	"github.com/salvacybersec/keyhunter/pkg/recon"
+)
+
+func bingStubHandler(t *testing.T, calls *int32) http.HandlerFunc {
+	t.Helper()
+	return func(w http.ResponseWriter, r *http.Request) {
+		atomic.AddInt32(calls, 1)
+		if !strings.HasPrefix(r.URL.Path, "/v7.0/search") {
+			t.Errorf("unexpected path: %s", r.URL.Path)
+		}
+		if got := r.Header.Get("Ocp-Apim-Subscription-Key"); got != "testkey" {
+			t.Errorf("missing subscription key header: %q", got)
+		}
+		body := map[string]any{
+			"webPages": map[string]any{
+				"value": []map[string]any{
+					{"name": "result1", "url": "https://pastebin.com/xyz789", "snippet": "found"},
+					{"name": "result2", "url": "https://github.com/user/repo/blob/main/.env", "snippet": "key"},
+					{"name": "result3", "url": "https://example.com/leak", "snippet": "data"},
+				},
+			},
+		}
+		w.Header().Set("Content-Type", "application/json")
+		_ = json.NewEncoder(w).Encode(body)
+	}
+}
+
+func TestBingDorkSource_EnabledRequiresAPIKey(t *testing.T) {
+	reg := syntheticRegistry()
+	lim := recon.NewLimiterRegistry()
+
+	if s := NewBingDorkSource("", reg, lim); s.Enabled(recon.Config{}) {
+		t.Error("expected Enabled=false with empty key")
+	}
+	if s := NewBingDorkSource("key", reg, lim); !s.Enabled(recon.Config{}) {
+		t.Error("expected Enabled=true with key")
+	}
+}
+
+func TestBingDorkSource_SweepEmptyKeyReturnsNil(t *testing.T) {
+	reg := syntheticRegistry()
+	lim := recon.NewLimiterRegistry()
+	s := NewBingDorkSource("", reg, lim)
+
+	out := make(chan recon.Finding, 10)
+	if err := s.Sweep(context.Background(), "", out); err != nil {
+		t.Fatalf("expected nil, got %v", err)
+	}
+	close(out)
+	if n := countFindings(out); n != 0 {
+		t.Fatalf("expected 0 findings, got %d", n)
+	}
+}
+
+func TestBingDorkSource_SweepEmitsFindings(t *testing.T) {
+	reg := syntheticRegistry()
+	lim := recon.NewLimiterRegistry()
+	_ = lim.For("bing", 1000, 100)
+
+	var calls int32
+	srv := httptest.NewServer(bingStubHandler(t, &calls))
+	defer srv.Close()
+
+	s := NewBingDorkSource("testkey", reg, lim)
+	s.BaseURL = srv.URL
+
+	out := make(chan recon.Finding, 32)
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	defer cancel()
+
+	done := make(chan error, 1)
+	go func() { done <- s.Sweep(ctx, "", out); close(out) }()
+
+	var findings []recon.Finding
+	for f := range out {
+		findings = append(findings, f)
+	}
+	if err := <-done; err != nil {
+		t.Fatalf("Sweep error: %v", err)
+	}
+
+	// 2 keywords * 3 items = 6 findings
+	if len(findings) != 6 {
+		t.Fatalf("expected 6 findings, got %d", len(findings))
+	}
+	for _, f := range findings {
+		if f.SourceType != "recon:bing" {
+			t.Errorf("SourceType=%q want recon:bing", f.SourceType)
+		}
+	}
+	if got := atomic.LoadInt32(&calls); got != 2 {
+		t.Errorf("expected 2 calls, got %d", got)
+	}
+}
+
+func TestBingDorkSource_CtxCancelled(t *testing.T) {
+	reg := syntheticRegistry()
+	lim := recon.NewLimiterRegistry()
+	_ = lim.For("bing", 1000, 100)
+
+	s := NewBingDorkSource("key", reg, lim)
+	s.BaseURL = "http://127.0.0.1:1"
+
+	ctx, cancel := context.WithCancel(context.Background())
+	cancel()
+
+	out := make(chan recon.Finding, 1)
+	err := s.Sweep(ctx, "", out)
+	if !errors.Is(err, context.Canceled) {
+		t.Fatalf("expected context.Canceled, got %v", err)
+	}
+}
+
+func TestBingDorkSource_Unauthorized(t *testing.T) {
+	reg := syntheticRegistry()
+	lim := recon.NewLimiterRegistry()
+	_ = lim.For("bing", 1000, 100)
+
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(http.StatusUnauthorized)
+		_, _ = w.Write([]byte("invalid key"))
+	}))
+	defer srv.Close()
+
+	s := NewBingDorkSource("key", reg, lim)
+	s.BaseURL = srv.URL
+
+	out := make(chan recon.Finding, 1)
+	err := s.Sweep(context.Background(), "", out)
+	if !errors.Is(err, ErrUnauthorized) {
+		t.Fatalf("expected ErrUnauthorized, got %v", err)
+	}
+}