Add full text search example

[borisno2]

Adds a new extend-full-text-search example demonstrating how to use Prisma's Full-Text Search on PostgreSQL with Keystone.

The example shows two things working together: using extendPrismaSchema at the db config level to inject the fullTextSearchPostgres preview feature into the Prisma generator block, and a custom searchPosts GraphQL query that uses context.prisma directly (since Keystone's context.db doesn't expose Prisma's search operator) before returning properly-typed Keystone objects.

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	fast-deep-equal@​3.1.3
	fast-glob@​3.3.3
	js-yaml@​4.1.1
	chalk@​4.1.2
	resolve@​1.22.11
	react@​19.2.4
	zod@​4.3.6
	typescript@​5.9.3
	react-dom@​19.2.4

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