fix(codegen): include partition keys in hooks update/delete mutation variables

[pyramation]

Summary

Extends the partition key fix from PR #1295 (ORM model generator) to also cover React Query mutation hooks.

Previously, generateUpdateMutationHook and generateDeleteMutationHook only included the primary key field in the mutation variable type. For partitioned tables (e.g. those with databaseId), the generated hooks would produce type errors because the ORM's where type now requires the extra keys.

Changes:

1. Extracted getExtraInputKeys to shared utils.ts — was previously a private function in model-generator.ts. Both ORM and hooks generators now import from the same source.

2. mutations.ts — generateUpdateMutationHook: discovers extra required fields via typeRegistry, adds them to updateVarType, the destructured arrow param, and the ORM .where object.

3. mutations.ts — generateDeleteMutationHook: same treatment — extra keys appear in deleteVarType, destructured param, and .where.

4. MutationGeneratorOptions gains typeRegistry?: TypeRegistry, threaded from index.ts via customOperations.typeRegistry.

// Before (generated hook):
mutate({ id: 'abc' })
// → Error: databaseId is required

// After:
mutate({ id: 'abc', databaseId: 'xyz' })
// → works

Link to Devin session: https://app.devin.ai/sessions/b2291a8e333e445aa125a2efd1996206
Requested by: @pyramation

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