Enable Prisma multiSchema previewFeatures if necessary

[lsmith77]

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

Summary by CodeRabbit

• Bug Fixes
  • Improved database feature detection for schema generation: the system now detects and enables relevant preview features for multi-schema support and PostgreSQL extensions when present, ensuring generated schemas align with datasource capabilities and reducing manual configuration.

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[coderabbitai]

📝 Walkthrough

Walkthrough

The Prisma schema generator now inspects datasource config for both schemas and extensions and conditionally enables corresponding preview features: multiSchema when schemas are present and postgresqlExtensions when extensions are present, combining them as needed.

Changes

Cohort / File(s)	Summary
Prisma Schema Feature Detection packages/sdk/src/prisma/prisma-schema-generator.ts	Replaces single-feature toggle with datasource-aware detection. Populates previewFeatures with multiSchema if datasource.schemas exists and postgresqlExtensions if datasource.extensions exists; supports enabling both simultaneously while preserving existing generation flow.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

Poem

🐰 I sniff the schemas, I hop through the fields,
Extensions and scopes in tidy new yields,
I stitch preview flags where configs abide,
Now schemas and extensions both dance side by side. 🥕✨

🚥 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 are detected, but the summary does not indicate preservation of @@Schema() attributes on models, which is also required by the issue.	Confirm whether this PR alone fully preserves both datasource.schemas array AND @@Schema() model attributes, or if additional changes are needed in the schema generation logic.

✅ 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 'Enable Prisma multiSchema previewFeatures if necessary' accurately describes the main code change, which enables the multiSchema preview feature conditionally based on datasource configuration.
Out of Scope Changes check	✅ Passed	The changes are focused on conditional preview feature activation based on datasource configuration, which is directly related to enabling multi-schema support as specified in issue #605.
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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