feat(auth): add username field to user schema and authentication process

- Updated user schema to include a unique username field.
- Modified authentication logic to support sign-in using either email or username.
- Enhanced sign-up process to require a username and validate its uniqueness.
- Updated login and profile routes to reflect changes in user identification.
- Adjusted frontend forms to accommodate username input alongside email.

drizzle/0009_true_gravity.sql

@@ -0,0 +1,51 @@
+PRAGMA foreign_keys=OFF;--> statement-breakpoint
+ALTER TABLE `user` ADD `username` text;--> statement-breakpoint
+UPDATE `user`
+SET `username` = `name`
+WHERE `username` IS NULL OR trim(`username`) = '';--> statement-breakpoint
+UPDATE `user`
+SET `username` = `username` || '_' || substr(`id`, 1, 6)
+WHERE `id` IN (
+	SELECT u1.`id`
+	FROM `user` u1
+	JOIN `user` u2
+		ON lower(u1.`username`) = lower(u2.`username`)
+		AND u1.`id` > u2.`id`
+);--> statement-breakpoint
+CREATE TABLE `__new_user` (
+	`id` text PRIMARY KEY NOT NULL,
+	`name` text NOT NULL,
+	`username` text NOT NULL,
+	`email` text NOT NULL,
+	`email_verified` integer DEFAULT false NOT NULL,
+	`image` text,
+	`is_admin` integer DEFAULT false NOT NULL,
+	`created_at` integer DEFAULT (cast(unixepoch('subsecond') * 1000 as integer)) NOT NULL,
+	`updated_at` integer DEFAULT (cast(unixepoch('subsecond') * 1000 as integer)) NOT NULL
+);--> statement-breakpoint
+INSERT INTO `__new_user` (
+	`id`,
+	`name`,
+	`username`,
+	`email`,
+	`email_verified`,
+	`image`,
+	`is_admin`,
+	`created_at`,
+	`updated_at`
+)
+SELECT
+	`id`,
+	`name`,
+	`username`,
+	`email`,
+	`email_verified`,
+	`image`,
+	`is_admin`,
+	`created_at`,
+	`updated_at`
+FROM `user`;--> statement-breakpoint
+DROP TABLE `user`;--> statement-breakpoint
+ALTER TABLE `__new_user` RENAME TO `user`;--> statement-breakpoint
+CREATE UNIQUE INDEX `user_username_unique` ON `user` (`username`);--> statement-breakpoint
+PRAGMA foreign_keys=ON;