LOOPIN-025 — Prepare seed/demo data

[shaig-mahmudov]

• Type: Backend / Demo
• Priority: High
• Branch: feature/LOOPIN-025-seed-demo-data
• Description: Seed the database with adequate sample users, groups, events, and requests for display.
• Acceptance Criteria:
  • Seed data includes 1 admin, 5 users, 8 events, 8 groups, and 10 requests.