feat: add users, sessions, and api_keys tables

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

drizzle/0007_icy_prodigy.sql

@@ -0,0 +1,23 @@
+CREATE TABLE `api_keys` (
+	`id` integer PRIMARY KEY AUTOINCREMENT NOT NULL,
+	`name` text NOT NULL,
+	`key_hash` text NOT NULL,
+	`key_prefix` text NOT NULL,
+	`created_at` integer NOT NULL
+);
+--> statement-breakpoint
+CREATE TABLE `sessions` (
+	`id` text PRIMARY KEY NOT NULL,
+	`user_id` 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 TABLE `users` (
+	`id` integer PRIMARY KEY AUTOINCREMENT NOT NULL,
+	`username` text NOT NULL,
+	`password_hash` text NOT NULL,
+	`created_at` integer NOT NULL
+);
+--> statement-breakpoint
+CREATE UNIQUE INDEX `users_username_unique` ON `users` (`username`);