Fix supabase db push in CI by passing --project-ref directly

The supabase link command was running from repo root while db push
ran from apps/supabase, causing it to not find the linked project.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.github/workflows/deploy-supabase.yml

@@ -26,11 +26,8 @@ jobs:
         with:
           version: latest
 
-      - name: Link to Production Project
-        run: supabase link --project-ref $SUPABASE_PROJECT_REF
-
       - name: Apply Database Migrations
-        run: supabase db push
+        run: supabase db push --project-ref $SUPABASE_PROJECT_REF
         working-directory: apps/supabase
 
       - name: Sync Edge Function Secrets