fix: align Prisma 8 templates with rc6

[AmanVarshney01]

Summary

• align generated apps with prisma@next 8.0.0-rc.6 and ORM rc.4
• update Composer and Composer Cloud to 0.10.0 so the ORM family resolves coherently
• replace the split prisma-next.config.ts setup with the consolidated prisma.config.ts
• point Composer's Prisma Postgres migration resource at the consolidated config
• inherit rc.6's typed TypeScript starter relations, removing the fallback warnings

Verification

• 17/17 unit tests pass
• all 144 template/provider/authoring/package-manager combinations render and pass structural assertions
• typecheck, format, lint, and package build pass
• clean Next.js + TypeScript + PostgreSQL + Bun scaffold installs without Prisma peer warnings
• prisma@next contract emit succeeds using the relative paths generated by orm init
• Next.js production build succeeds
• Composer 0.10 loads prisma.config.ts and reaches local PostgreSQL provisioning; the local smoke stopped afterward because an unrelated existing Prisma Dev process already owned its allocated database port

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PR preview published

• Version: 0.4.2-pr.54.203.1
• Tag: pr54
• Run with Bun: bunx create-prisma@pr54
• Run with npm: npx create-prisma@pr54
• Run with Yarn: yarn dlx create-prisma@pr54
• Run with pnpm: pnpm dlx create-prisma@pr54
• Run with Deno: deno run -A npm:create-prisma@pr54
• Workflow run: https://github.com/prisma/create-prisma/actions/runs/32168258226