Enable Prisma multiSchema previewFeatures if necessary

[lsmith77]

fixes #605
see also zenstackhq/zenstack-docs#555

Summary by CodeRabbit

Release Notes

• Bug Fixes
  • Improved database feature detection for schema generation to intelligently enable appropriate preview features based on actual datasource configuration, including multi-schema support and database extensions.

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[coderabbitai]

📝 Walkthrough

Walkthrough

The change modifies the Prisma schema generator to intelligently detect and activate preview features based on datasource configuration. It now conditionally enables multiSchema when schemas exist and postgresqlExtensions when extensions are present, replacing the previous unconditional extension-only approach.

Changes

Cohort / File(s)	Summary
Prisma Schema Feature Detection packages/sdk/src/prisma/prisma-schema-generator.ts	Replaces single-feature toggle with generalized feature detection. Now conditionally populates previewFeatures with multiSchema and/or postgresqlExtensions based on datasource configuration, supporting both schema and extension preservation.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

Poem

🐰 Through multiple schemas we skip and we stride,
Features detected with careful delight,
What once slipped away now stays at our side,
Each schema and extension shines ever so bright! ✨

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 inconclusive)

Check name	Status	Explanation	Resolution
Linked Issues check	❓ Inconclusive	The PR partially addresses issue #605 by enabling the multiSchema preview feature when schemas exist, but the changes shown only cover feature flag activation, not preservation of @@Schema attributes or datasource.schemas array.	Verify that the complete PR implementation includes logic to preserve datasource.schemas arrays and @@Schema() model attributes, not just preview feature flags.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: enabling Prisma's multiSchema preview feature when necessary, which directly addresses the linked issue about preserving multi-schema configuration.
Out of Scope Changes check	✅ Passed	The changes to prisma-schema-generator.ts are directly scoped to resolving issue #605 by enabling appropriate Prisma preview features for multi-schema support.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

• 📝 Generate docstrings

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[lsmith77]

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