Add leads handlers, WhatsApp integration, and test files

apps/go-crm/internal/whatsapp/connector.go

@@ -0,0 +1,40 @@
+package whatsapp
+
+import (
+	"context"
+	"time"
+)
+
+type ConnectionState string
+
+const (
+	StateDisconnected ConnectionState = "disconnected"
+	StateConnecting   ConnectionState = "connecting"
+	StateWaitingQR    ConnectionState = "waiting_qr"
+	StateConnected    ConnectionState = "connected"
+	StateFailed       ConnectionState = "failed"
+)
+
+type QRFrame struct {
+	QR    string
+	State ConnectionState
+	Error string
+}
+
+type Contact struct {
+	Phone   string
+	Name    string
+	FromMe  bool
+	Time    time.Time
+}
+
+type ContactHandler interface {
+	OnContact(ctx context.Context, clientID int64, contact Contact) error
+}
+
+type Connector interface {
+	Connect(ctx context.Context, clientID int64) (<-chan QRFrame, error)
+	Disconnect(ctx context.Context, clientID int64) error
+	IsConnected(ctx context.Context, clientID int64) (bool, error)
+	SetClientDB(db interface{})
+}