feat: implement user management features including creation, updating, and deletion of users

- Added user management routes and logic in `+page.server.ts` for creating, updating, resetting passwords, and deleting users.
- Created a user management interface in `+page.svelte` with dialogs for user actions.
- Integrated password validation and hashing using `@node-rs/argon2`.
- Updated database schema to include a `user` table with necessary fields.
- Seeded a default admin user during database migration if no users exist.
- Added necessary dependencies in `package.json`.

DOCUMENTATION.md

@@ -700,6 +700,12 @@ A web dashboard (`dashboard/` directory) for browsing, triaging, and downloading
   - Individual file download and bulk ZIP download (all files + report metadata)
   - Report deletion with confirmation dialog
   - Dark mode UI matching EMLy's aesthetic
+- **Authentication**: Session-based auth with Lucia v3 + Drizzle ORM adapter
+  - Default admin account: username `admin`, password `admin` (seeded on first migration)
+  - Password hashing with argon2 via `@node-rs/argon2`
+  - Session cookies with automatic refresh
+  - Role-based access: `admin` and `user` roles
+- **User Management**: Admin-only `/users` page for creating/deleting dashboard users
 - **Development**: `cd dashboard && bun install && bun dev` (localhost:3001)
 
 #### Configuration (config.ini)