feat: enhance project structure with server and workflow management

- Introduced a new server package with Fastify for handling API requests and workflows.
- Implemented user authentication and authorization with JWT and cookie management.
- Added endpoints for managing workflows, runs, and user accounts.
- Established a dashboard for monitoring workflow status and statistics.
- Included a script sandbox for executing user-defined scripts securely.
- Updated README with setup instructions and API documentation.
- Configured database migrations for user management.
- Enhanced logging capabilities for better traceability.

packages/server/migrations/20260814120000_users.js

@@ -0,0 +1,20 @@
+/**
+ * @param {import("knex").Knex} knex
+ */
+export async function up(knex) {
+  await knex.schema.createTable("users", (t) => {
+    t.text("id").primary();
+    t.text("username").notNullable().unique();
+    t.text("password_hash").notNullable();
+    t.text("role").notNullable();
+    t.text("created_at").notNullable();
+    t.text("updated_at").notNullable();
+  });
+}
+
+/**
+ * @param {import("knex").Knex} knex
+ */
+export async function down(knex) {
+  await knex.schema.dropTableIfExists("users");
+}