BE-046: POST /agora/token generates valid RTC token

Track: 1 — MVP
Section: 1.13 Agora Token Generation
Status: [ ] Todo
Repo: backend-api
Branch: feature/BE-046-agora-token-generation

Done When

Returns { token, channel, uid, expires_at }. Token is valid Agora RTC token string. Expiry = session duration + 30 min

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