feat(email): add independent send-link endpoint and transactional ema…

[Bnabdulwasiu]

📖 Description

Adds an independent endpoint to send transactional LiveKit room invitations via email, integrates dynamic HTML templates, and includes robustness fixes for local E2E developer testing.

🚀 Key Changes

• Email Template: Added a styled HTML invitation template at app/templates/emails/interview_invite.html with room access instructions.
• Email Service: Added send_interview_link_email using the Resend client in app/services/email_service.py.
• API Route: Added the independent POST /api/v1/interviews/{interview_id}/send-link endpoint to allow custom recipient email sharing.
• E2E Robustness: Added backend candidate auto-creation on interview creation to prevent 404 errors, and a graceful fallback to a default mock plan if the local GEMINI_API_KEY is missing/invalid.

🧪 Verification

Ran backend integration tests:

• uv run pytest tests/test_interviews.py — 14/14 tests PASSED (100% success rate).

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/livekit-email-invite

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