fix(build): run prisma generate before next build

Ensures the Prisma client types are always regenerated from the current
schema before compilation. Without this, schema changes (e.g. making
passwordHash nullable) cause TypeScript errors on the build server if
prisma generate hasn't been run manually after pulling.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

App/package.json

@@ -4,7 +4,7 @@
     "private":  true,
     "scripts":  {
                     "dev":  "next dev --turbopack",
-                    "build":  "next build",
+                    "build":  "prisma generate && next build",
                     "start":  "next start",
                     "lint":  "next lint",
                     "type-check":  "tsc --noEmit",