Seed data and demo environment

[robert197]

Description

Create seed data for development and demo purposes. Essential for Claude Code development workflow.

Requirements

• Management command: python manage.py seed_demo_data
• Creates:
  • 3 demo owners (with passwords documented in .env.example)
  • 5 apartments across owners (various access methods)
  • 2 inspectors
  • 15 inspections (mix of completed, scheduled, in-progress)
  • Inspection items with realistic results (mix of OK/Flag)
  • Sample photos (placeholder images)
  • Default checklist templates per apartment
  • Subscription records
• Idempotent (safe to run multiple times)
• Uses factory_boy factories for consistency

Acceptance Criteria

• python manage.py seed_demo_data populates database
• All features testable with seed data
• Demo accounts documented
• Idempotent execution

[robert197]

Dependencies: Blocked by #7, #8, #10, #12, #15, #19, #20, #23, #16. See build order in #44.