BE-041: POST /coach/sessions — create session with validation

Track: 1 — MVP
Section: 1.12 Live Session Lifecycle
Status: [ ] Todo
Repo: backend-api
Branch: feature/BE-041-create-session

Done When

Creates session with title, scheduled_at (future), duration_minutes, price, max_participants. Returns session with status="scheduled". Past date rejected with 422

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