feat: add reusable private and shared account icons

apps/api/prisma/migrations/005_account_icons/migration.sql

@@ -0,0 +1,16 @@
+CREATE TABLE `Icon` (
+  `id` CHAR(36) NOT NULL,
+  `ownerId` CHAR(36) NULL,
+  `name` VARCHAR(100) NOT NULL,
+  `shared` BOOLEAN NOT NULL DEFAULT false,
+  `hash` CHAR(64) NOT NULL,
+  `data` MEDIUMBLOB NOT NULL,
+  `source` VARCHAR(500) NULL,
+  `createdAt` DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
+  PRIMARY KEY (`id`),
+  UNIQUE INDEX `Icon_ownerId_hash_shared_key` (`ownerId`, `hash`, `shared`),
+  INDEX `Icon_shared_name_idx` (`shared`, `name`),
+  CONSTRAINT `Icon_ownerId_fkey` FOREIGN KEY (`ownerId`) REFERENCES `User` (`id`) ON DELETE SET NULL ON UPDATE CASCADE
+) DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
+ALTER TABLE `Position` ADD COLUMN `iconId` CHAR(36) NULL;
+ALTER TABLE `Position` ADD CONSTRAINT `Position_iconId_fkey` FOREIGN KEY (`iconId`) REFERENCES `Icon` (`id`) ON DELETE SET NULL ON UPDATE CASCADE;