[TK-01] Supabase Edge Function: auth → LiveKit JWT with room naming convention (retry 1)

## TK-01: Supabase Edge Function: auth → LiveKit JWT with room naming convention Section: Token Generation | Milestone: M1 | Owner: Desktop Lu ### Failing Tests - **edge_fn_file** (file_exists): File `c8-audio/supabase/functions/livekit-token/index.ts` must exist - **access_token** (grep): Pattern `AccessToken` in `c8-audio/supabase/functions/livekit-token/index.ts` (need 1+ matches) - **auth_verify** (grep): Pattern `getUser|auth` in `c8-audio/supabase/functions/livekit-token/index.ts` (need 1+ matches) - **room_naming** (grep): Pattern `c8-voice` in `c8-audio/supabase/functions/livekit-token/index.ts` (need 1+ matches) - **room_join_grant** (grep): Pattern `roomJoin|room_join` in `c8-audio/supabase/functions/livekit-token/index.ts` (need 1+ matches) - **token_ttl** (grep): Pattern `ttl|expir` in `c8-audio/supabase/functions/livekit-token/index.ts` (need 1+ matches) ### Acceptance Criteria - File `c8-audio/supabase/functions/livekit-token/index.ts` must exist - File matching `c8-audio/supabase/functions/livekit-token/index.ts` must contain pattern `AccessToken` - File matching `c8-audio/supabase/functions/livekit-token/index.ts` must contain pattern `getUser|auth` - File matching `c8-audio/supabase/functions/livekit-token/index.ts` must contain pattern `c8-voice` - File matching `c8-audio/supabase/functions/livekit-token/index.ts` must contain pattern `roomJoin|room_join` - File matching `c8-audio/supabase/functions/livekit-token/index.ts` must contain pattern `ttl|expir` ### Codebase Conventions - Trilingual comments: // EN: ... // VI: ... // ES: ... - SPEC section refs in comments - Zod at module level with .safeParse() - (supabase as any) with eslint-disable - NextResponse.json() responses - Error format: { error: 'message' }