feat: initial backend store prototype

store/drizzle/0000_dark_squirrel_girl.sql

@@ -0,0 +1,10 @@
+CREATE TABLE "nodes" (
+	"id" serial NOT NULL,
+	"content" "bytea" NOT NULL,
+	"definition" json NOT NULL
+);
+--> statement-breakpoint
+CREATE TABLE "users" (
+	"id" serial PRIMARY KEY NOT NULL,
+	"name" text
+);