feat(schema): restore complete Ent schema files

internal/ent/schema/permission.go

@@ -0,0 +1,32 @@
+package schema
+
+import (
+	"entgo.io/ent"
+	"entgo.io/ent/schema/edge"
+	"entgo.io/ent/schema/field"
+)
+
+// Permission holds the schema definition for the Permission entity.
+type Permission struct {
+	ent.Schema
+}
+
+// Fields of the Permission.
+func (Permission) Fields() []ent.Field {
+	return []ent.Field{
+		field.String("id").
+			Unique().
+			Immutable(),
+		field.String("name").
+			Unique().
+			NotEmpty().
+			Comment("Format: module.resource.action"),
+	}
+}
+
+// Edges of the Permission.
+func (Permission) Edges() []ent.Edge {
+	return []ent.Edge{
+		edge.To("role_permissions", RolePermission.Type),
+	}
+}