Initialize Phase 0 monorepo skeleton (T-001)

core/application/doc.go

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+// Package application coordinates SoftBox use cases through injected ports.
+package application

core/domain/doc.go

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+// Package domain contains SoftBox business models and rules.
+package domain

core/go.mod

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+module softbox.local/core
+
+go 1.20

core/product.go

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+// Package core exposes shared, UI-independent SoftBox functionality.
+package core
+
+// ProductName is the stable display name shared by both application targets.
+const ProductName = "SoftBox"

core/product_test.go

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+package core
+
+import "testing"
+
+func TestProductName(t *testing.T) {
+	if ProductName != "SoftBox" {
+		t.Fatalf("ProductName = %q, want %q", ProductName, "SoftBox")
+	}
+}