feat: add Bytescale image uploads

backend/prisma/migrations/20260414074145_doctor_image_field/migration.sql

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+-- AlterTable
+ALTER TABLE "Doctor" ADD COLUMN     "image" TEXT;

backend/prisma/migrations/20260414102430_department_image/migration.sql

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+-- AlterTable
+ALTER TABLE "Department" ADD COLUMN     "image" TEXT;

backend/prisma/migrations/20260414105925_news_media/migration.sql

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+-- CreateTable
+CREATE TABLE "NewsImage" (
+    "id" SERIAL NOT NULL,
+    "url" TEXT NOT NULL,
+    "newsMediaId" INTEGER NOT NULL,
+    "createdAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+
+    CONSTRAINT "NewsImage_pkey" PRIMARY KEY ("id")
+);
+
+-- AddForeignKey
+ALTER TABLE "NewsImage" ADD CONSTRAINT "NewsImage_newsMediaId_fkey" FOREIGN KEY ("newsMediaId") REFERENCES "NewsMedia"("id") ON DELETE CASCADE ON UPDATE CASCADE;