[WIP] Update terminal structure for zones

[Copilot]

• Create backend/simulation/ package with __init__.py
• Implement backend/simulation/parking_simulation.py with:
  • 4 parking zones (P1–P4), each with 4 spots
  • Highway H0–H16 with cars moving along it
  • Entry/exit lanes (E_z0, E_z1) per zone
  • Multithreaded car lifecycle (spawn → drive → park 10 s → exit)
  • Live terminal display matching the provided template (car emoji 🚗)
  • Per-zone stats: Earnings, Time Used, Idle Time, Available
  • Global stats: total arrived, parked, turned away
• Create backend/tests/test_parking_simulation.py with unit tests for core logic
• Manually verify simulation runs correctly

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