Revert "chore(app): remove the duplicated prisma/ setup"

[Marfuen]

This reverts commit f7fb820.

What does this PR do?

• Fixes #XXXX (GitHub issue number)
• Fixes COMP-XXXX (Linear issue number - should be visible at the bottom of the GitHub issue description)

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---

Summary by cubic

Reverts the Prisma cleanup and restores an app-local prisma/ in apps/app so the client is generated before next build. Adds a postinstall/build flow to copy schemas and patch generated extensions.

• Refactors

  • Reintroduced apps/app/prisma/ with prisma.config.ts pointing to prisma/schema and DATABASE_URL.
  • Added minimal prisma/schema/schema.prisma that generates the client to src/generated/prisma and enables postgresqlExtensions (pgcrypto).
  • Updated scripts: db:getschema (copies model files from packages/db), db:generate, build:docker, prebuild, postinstall; they run prisma generate and packages/db/scripts/fix-generated-extensions.js on src/generated/prisma.
  • Updated .gitignore to exclude generated client and copied schema files (only schema.prisma is committed).

• Migration

  • Ensure DATABASE_URL is set.
  • Run a fresh install to trigger postinstall (or run bun run db:generate).
  • Use build:docker so the client is generated before next build.

^{Written for commit 5ca5050. Summary will update on new commits.}

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Project	Deployment	Actions	Updated (UTC)
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[claudfuen]

🎉 This PR is included in version 3.27.0 🎉

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