Add blog schema with BlogPost entity and shop blog toggle.

Introduces blog_posts table and blogEnabled on shop_settings for optional storefront blog.

backend/src/database/migrations/1784900000000-add-blog.ts

@@ -0,0 +1,17 @@
+import { MigrationInterface, QueryRunner } from 'typeorm';
+
+export class AddBlog1784900000000 implements MigrationInterface {
+    name = 'AddBlog1784900000000';
+
+    public async up(queryRunner: QueryRunner): Promise<void> {
+        await queryRunner.query(
+            `CREATE TABLE "blog_posts" ("id" uuid NOT NULL DEFAULT uuid_generate_v4(), "title" character varying NOT NULL, "thumbnailUrl" character varying, "bannerUrl" character varying, "contentHtml" text NOT NULL, "isDraft" boolean NOT NULL DEFAULT true, "createdAt" TIMESTAMP NOT NULL DEFAULT now(), "updatedAt" TIMESTAMP NOT NULL DEFAULT now(), CONSTRAINT "PK_blog_posts_id" PRIMARY KEY ("id"))`
+        );
+        await queryRunner.query(`ALTER TABLE "shop_settings" ADD "blogEnabled" boolean NOT NULL DEFAULT false`);
+    }
+
+    public async down(queryRunner: QueryRunner): Promise<void> {
+        await queryRunner.query(`ALTER TABLE "shop_settings" DROP COLUMN "blogEnabled"`);
+        await queryRunner.query(`DROP TABLE "blog_posts"`);
+    }
+}