feat: rebuild workspaces as the reference plugin

plugins/workspaces/migrations/mysql/0001_adopt_user_workspaces.sql

@@ -0,0 +1,19 @@
+-- workspaces 0001: adopt_user_workspaces
+-- Generated by termix-plugin migrations. Review before committing.
+
+CREATE TABLE IF NOT EXISTS `user_workspaces` (
+  `id` int AUTO_INCREMENT PRIMARY KEY,
+  `user_id` varchar(255) NOT NULL,
+  `name` text NOT NULL,
+  `color` text,
+  `icon` text,
+  `kind` text NOT NULL DEFAULT ('manual'),
+  `is_default` boolean NOT NULL DEFAULT false,
+  `payload` text NOT NULL DEFAULT ('{}'),
+  `sync_id` varchar(255) UNIQUE,
+  `created_at` text NOT NULL DEFAULT (CURRENT_TIMESTAMP),
+  `updated_at` text NOT NULL DEFAULT (CURRENT_TIMESTAMP),
+  `last_used_at` text,
+  FOREIGN KEY (`user_id`) REFERENCES `users` (`id`) ON DELETE CASCADE
+);
+RENAME TABLE `user_workspaces` TO `p_workspaces_workspaces`;