feat(web): initialize Next.js project with Tailwind CSS and TypeScript setup

pkg/executors/executor.go

@@ -0,0 +1,17 @@
+package executors
+
+import (
+	"context"
+
+	"github.com/lyzrai/flow/pkg/engine"
+	"github.com/lyzrai/flow/pkg/models"
+)
+
+// NodeExecutor is the interface that all node type executors implement.
+type NodeExecutor interface {
+	// Execute runs the node logic.
+	// inputs[i] holds the items received on input port i.
+	// Returns map[outputIndex]items. Single-output nodes return {0: items}.
+	// Branching nodes (If, Switch) route items to multiple output indices.
+	Execute(ctx context.Context, node models.NodeDef, inputs [][]models.Item, execCtx *engine.ExecutionContext) (map[int][]models.Item, error)
+}