🗃️ db: update schema for new collection

prisma/migrations/20260327155457_add_collection_unique_by_owner_and_id/migration.sql

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+/*
+  Warnings:
+
+  - You are about to alter the column `name` on the `collections` table. The data in that column could be lost. The data in that column will be cast from `VarChar(255)` to `VarChar(115)`.
+  - A unique constraint covering the columns `[slug,ownerId]` on the table `collections` will be added. If there are existing duplicate values, this will fail.
+  - Added the required column `slug` to the `collections` table without a default value. This is not possible if the table is not empty.
+
+*/
+-- AlterTable
+ALTER TABLE "collections" ADD COLUMN     "slug" VARCHAR(115) NOT NULL,
+ALTER COLUMN "name" SET DATA TYPE VARCHAR(115);
+
+-- CreateIndex
+CREATE UNIQUE INDEX "collections_slug_ownerId_key" ON "collections"("slug", "ownerId");