chore(deps): upgrade prisma, typescript, pnpm, and dev tooling

- prisma / @prisma/adapter-pg / @prisma/client: 7.5 → 7.8
- typescript: 5.9 → 6.0
- tsdown: 0.18 → 0.22
- pnpm: 10.32.1 → 11.3.0
- @types/node: 24 → 25, tsx: 4.21 → 4.22, vitest: 4.1.0 → 4.1.7
- pnpm-workspace.yaml: add allowBuilds for pnpm 11 compatibility