add initial database schema with auth tables

- Create user, session, account, and verification tables for better-auth
  - Add basic task table with id, title, and priority fields
  - Include Drizzle migration metadata and snapshots

drizzle/0000_initial_auth_tables.sql

@@ -0,0 +1,53 @@
+CREATE TABLE `account` (
+	`id` text PRIMARY KEY NOT NULL,
+	`account_id` text NOT NULL,
+	`provider_id` text NOT NULL,
+	`user_id` text NOT NULL,
+	`access_token` text,
+	`refresh_token` text,
+	`id_token` text,
+	`access_token_expires_at` integer,
+	`refresh_token_expires_at` integer,
+	`scope` text,
+	`password` text,
+	`created_at` integer DEFAULT (cast(unixepoch('subsecond') * 1000 as integer)) NOT NULL,
+	`updated_at` integer NOT NULL,
+	FOREIGN KEY (`user_id`) REFERENCES `user`(`id`) ON UPDATE no action ON DELETE cascade
+);
+--> statement-breakpoint
+CREATE INDEX `account_userId_idx` ON `account` (`user_id`);--> statement-breakpoint
+CREATE TABLE `session` (
+	`id` text PRIMARY KEY NOT NULL,
+	`expires_at` integer NOT NULL,
+	`token` text NOT NULL,
+	`created_at` integer DEFAULT (cast(unixepoch('subsecond') * 1000 as integer)) NOT NULL,
+	`updated_at` integer NOT NULL,
+	`ip_address` text,
+	`user_agent` text,
+	`user_id` text NOT NULL,
+	FOREIGN KEY (`user_id`) REFERENCES `user`(`id`) ON UPDATE no action ON DELETE cascade
+);
+--> statement-breakpoint
+CREATE UNIQUE INDEX `session_token_unique` ON `session` (`token`);--> statement-breakpoint
+CREATE INDEX `session_userId_idx` ON `session` (`user_id`);--> statement-breakpoint
+CREATE TABLE `user` (
+	`id` text PRIMARY KEY NOT NULL,
+	`name` text NOT NULL,
+	`email` text NOT NULL,
+	`email_verified` integer DEFAULT false NOT NULL,
+	`image` text,
+	`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
+CREATE UNIQUE INDEX `user_email_unique` ON `user` (`email`);--> statement-breakpoint
+CREATE TABLE `verification` (
+	`id` text PRIMARY KEY NOT NULL,
+	`identifier` text NOT NULL,
+	`value` text NOT NULL,
+	`expires_at` integer 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
+CREATE INDEX `verification_identifier_idx` ON `verification` (`identifier`);