feat: refactor admin initialization to CLI and implement lobby WebSoc…

[aniebietafia]

…ket notifications

• Removed legacy admin initialization from application startup lifespan.
  • Replaced it with a Typer-based CLI tool (python -m app) supporting create-admin (interactive and --no-input), promote-admin, demote-admin (with last admin safety guard), and list-admins commands.
  • Cleared legacy admin environment variables from settings config and .env files.
• Added a dedicated lobby WebSocket endpoint at /ws/lobby/{room_code}.
  • Extended ConnectionManager with a separate registry and Redis Pub/Sub channel (ws:lobby:{room_code}) to isolate lobby messages.
  • Added reject, admit-all, and reject-all REST endpoints for host actions.
  • Ensured waitlisted users are persisted to the database on admission and notified dynamically.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 7ee9fb13-2b8e-4c19-8241-9c92beba6d25

📥 Commits

Reviewing files that changed from the base of the PR and between 0826958 and 6a04573.

📒 Files selected for processing (14)

• .env.prod.example
• app/__main__.py
• app/cli.py
• app/core/config.py
• app/core/init_admin.py
• app/main.py
• app/modules/meeting/api_docs.md
• app/modules/meeting/constants.py
• app/modules/meeting/router.py
• app/modules/meeting/service.py
• app/modules/meeting/ws_dependencies.py
• app/modules/meeting/ws_router.py
• app/services/connection_manager.py
• tests/meeting/test_meeting_service.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/create_admin_script

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