feat: rebuild workspaces as the reference plugin

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

@@ -0,0 +1,20 @@
+-- workspaces 0001: adopt_user_workspaces
+-- Generated by termix-plugin migrations. Review before committing.
+
+CREATE TABLE IF NOT EXISTS "user_workspaces" (
+  "id" integer PRIMARY KEY AUTOINCREMENT,
+  "user_id" text NOT NULL,
+  "name" text NOT NULL,
+  "color" text,
+  "icon" text,
+  "kind" text NOT NULL DEFAULT 'manual',
+  "is_default" integer NOT NULL DEFAULT 0,
+  "payload" text NOT NULL DEFAULT '{}',
+  "sync_id" text 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
+);
+CREATE INDEX IF NOT EXISTS "idx_user_workspaces_user_id" ON "user_workspaces" ("user_id");
+ALTER TABLE "user_workspaces" RENAME TO "p_workspaces_workspaces";