feat(auth): add Discord OAuth sign-in and user timezones

Add persistent user and session storage, protected profile requests, and React sign-in controls. Capture and preserve each user's timezone, and load development and production configuration before migrations and server startup.

drizzle/0000_discord_auth.sql

@@ -0,0 +1,22 @@
+CREATE TABLE `sessions` (
+	`token_hash` text PRIMARY KEY NOT NULL,
+	`user_id` text NOT NULL,
+	`created_at` integer NOT NULL,
+	`expires_at` integer NOT NULL,
+	FOREIGN KEY (`user_id`) REFERENCES `users`(`id`) ON UPDATE no action ON DELETE cascade
+);
+--> statement-breakpoint
+CREATE INDEX `sessions_user_id_idx` ON `sessions` (`user_id`);--> statement-breakpoint
+CREATE INDEX `sessions_expires_at_idx` ON `sessions` (`expires_at`);--> statement-breakpoint
+CREATE TABLE `users` (
+	`id` text PRIMARY KEY NOT NULL,
+	`discord_id` text NOT NULL,
+	`username` text NOT NULL,
+	`global_name` text,
+	`avatar_hash` text,
+	`timezone` text DEFAULT 'UTC' NOT NULL,
+	`created_at` integer NOT NULL,
+	`updated_at` integer NOT NULL
+);
+--> statement-breakpoint
+CREATE UNIQUE INDEX `users_discord_id_unique` ON `users` (`discord_id`);