new injection strategies

internal/injection/backend.go

@@ -0,0 +1,13 @@
+package injection
+
+import (
+	"context"
+	"time"
+)
+
+// Backend represents a text injection method
+type Backend interface {
+	Name() string
+	Available() error
+	Inject(ctx context.Context, text string, timeout time.Duration) error
+}