feat: add peer_approval_requests table and migration

packages/server/drizzle/0002_peer_approval_requests.sql

@@ -0,0 +1,10 @@
+CREATE TABLE `peer_approval_requests` (
+	`id` text PRIMARY KEY NOT NULL,
+	`origin` text NOT NULL,
+	`instance_name` text,
+	`hmac_secret` text NOT NULL,
+	`requested_at` integer NOT NULL,
+	`expires_at` integer NOT NULL
+);
+--> statement-breakpoint
+CREATE UNIQUE INDEX `peer_approval_requests_origin_unique` ON `peer_approval_requests` (`origin`);