Init V4 community edition (#2265)

* Init V4 community edition

* Init V4 community edition

ent/schema/setting.go

@@ -0,0 +1,30 @@
+package schema
+
+import (
+	"entgo.io/ent"
+	"entgo.io/ent/schema/field"
+)
+
+// Setting holds the schema definition for key-value setting entity.
+type Setting struct {
+	ent.Schema
+}
+
+func (Setting) Fields() []ent.Field {
+	return []ent.Field{
+		field.String("name").
+			Unique(),
+		field.Text("value").
+			Optional(),
+	}
+}
+
+func (Setting) Edges() []ent.Edge {
+	return nil
+}
+
+func (Setting) Mixin() []ent.Mixin {
+	return []ent.Mixin{
+		CommonMixin{},
+	}
+}