feat(auth): implement user authentication with JWT and NextAuth

- Added user registration and login functionality with JWT authentication.
- Created auth controller, service, and module in the backend.
- Implemented user model and user products management.
- Integrated NextAuth for session management on the frontend.
- Added middleware for protecting routes and handling public access.
- Updated frontend API routes to include authorization headers.
- Enhanced recipe and user product models to support ownership and visibility.
- Created registration and login pages in the frontend.
- Added necessary types for NextAuth session management.

backend/prisma/migrations/20260417200000_add_auth_and_recipe_visibility/migration.sql

@@ -0,0 +1,55 @@
+-- CreateTable: User
+CREATE TABLE `User` (
+  `id` INTEGER NOT NULL AUTO_INCREMENT,
+  `username` VARCHAR(191) NOT NULL,
+  `email` VARCHAR(191) NOT NULL,
+  `passwordHash` VARCHAR(191) NOT NULL,
+  `createdAt` DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
+  `updatedAt` DATETIME(3) NOT NULL,
+  PRIMARY KEY (`id`),
+  UNIQUE INDEX `User_username_key` (`username`),
+  UNIQUE INDEX `User_email_key` (`email`)
+) DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
+
+-- CreateTable: UserProduct
+CREATE TABLE `UserProduct` (
+  `id` INTEGER NOT NULL AUTO_INCREMENT,
+  `userId` INTEGER NOT NULL,
+  `productId` INTEGER NOT NULL,
+  `note` TEXT NULL,
+  `preferredBrand` VARCHAR(191) NULL,
+  `preferredStore` VARCHAR(191) NULL,
+  `isPrivate` BOOLEAN NOT NULL DEFAULT false,
+  `createdAt` DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
+  `updatedAt` DATETIME(3) NOT NULL,
+  PRIMARY KEY (`id`),
+  UNIQUE INDEX `UserProduct_userId_productId_key` (`userId`, `productId`),
+  INDEX `UserProduct_userId_idx` (`userId`),
+  INDEX `UserProduct_productId_idx` (`productId`)
+) DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
+
+-- CreateTable: RecipeShare
+CREATE TABLE `RecipeShare` (
+  `recipeId` INTEGER NOT NULL,
+  `userId` INTEGER NOT NULL,
+  PRIMARY KEY (`recipeId`, `userId`),
+  INDEX `RecipeShare_userId_idx` (`userId`)
+) DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
+
+-- AlterTable: Product add ownerId
+ALTER TABLE `Product` ADD COLUMN `ownerId` INTEGER NULL;
+
+-- AlterTable: Recipe add ownerId and isPublic
+ALTER TABLE `Recipe` ADD COLUMN `ownerId` INTEGER NULL,
+                     ADD COLUMN `isPublic` BOOLEAN NOT NULL DEFAULT false;
+
+-- Make all existing recipes (without owner) public
+UPDATE `Recipe` SET `isPublic` = true WHERE `ownerId` IS NULL;
+
+-- AddForeignKey
+ALTER TABLE `UserProduct` ADD CONSTRAINT `UserProduct_userId_fkey` FOREIGN KEY (`userId`) REFERENCES `User`(`id`) ON DELETE CASCADE ON UPDATE CASCADE;
+ALTER TABLE `UserProduct` ADD CONSTRAINT `UserProduct_productId_fkey` FOREIGN KEY (`productId`) REFERENCES `Product`(`id`) ON DELETE CASCADE ON UPDATE CASCADE;
+ALTER TABLE `RecipeShare` ADD CONSTRAINT `RecipeShare_recipeId_fkey` FOREIGN KEY (`recipeId`) REFERENCES `Recipe`(`id`) ON DELETE CASCADE ON UPDATE CASCADE;
+ALTER TABLE `RecipeShare` ADD CONSTRAINT `RecipeShare_userId_fkey` FOREIGN KEY (`userId`) REFERENCES `User`(`id`) ON DELETE CASCADE ON UPDATE CASCADE;
+ALTER TABLE `Product` ADD CONSTRAINT `Product_ownerId_fkey` FOREIGN KEY (`ownerId`) REFERENCES `User`(`id`) ON DELETE SET NULL ON UPDATE CASCADE;
+ALTER TABLE `Recipe` ADD CONSTRAINT `Recipe_ownerId_fkey` FOREIGN KEY (`ownerId`) REFERENCES `User`(`id`) ON DELETE SET NULL ON UPDATE CASCADE;