fix(signaling): inject from_user_id into all relayed WebRTC messages

[aniebietafia]

The backend was forwarding raw payloads without adding the sender's identity, causing the frontend to receive offers/answers with from_user_id = undefined. This silently dropped all WebRTC handshakes, preventing media from flowing between participants.

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

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Plan: Pro

Run ID: 4b29742a-51ac-4f0f-952b-862dd19144fb

📥 Commits

Reviewing files that changed from the base of the PR and between df722ea and a67133e.

📒 Files selected for processing (2)

• app/modules/meeting/ws_router.py
• tests/meeting/test_ws_router.py

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• Create PR with unit tests
• Commit unit tests in branch fixes/production_bugs

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