Implement ElevenLabs API key management and failover logic

Refactor BlogUrlForm to remove Pro gating for music tab; update ProjectReviewPrompt to support initial rating and star click; enhance ShareProjectModal with success note; adjust Pricing to make music addition free; clean up ProjectView by removing Pro gating logic for background music and integrating star review modal.

updated sakura video composition

sakura template added

chore: add background music updates

cache updated

crafted template architecture done

Email sending done

email sender modified

custom template flow refined

Voice over issue and abbreviation issue resolved

feat: add alembic migration