Fix production deploy: sync lockfile, Prisma engines, and build.

The Docker build failed because pnpm-lock.yaml was stale after removing Sanity
and adding Prisma/admin deps. Bundle debian-openssl-3.0.x engines for
node:20-slim, fix invalid tiptap package, and avoid DB access during next build.

Co-authored-by: Cursor <cursoragent@cursor.com>

prisma/schema.prisma

@@ -1,5 +1,6 @@
 generator client {
-  provider = "prisma-client-js"
+  provider      = "prisma-client-js"
+  binaryTargets = ["native", "debian-openssl-3.0.x"]
 }
 
 datasource db {