fix(react-router): preserve required params in generatePath types

[grzdev]

Summary

generatePath currently types all path params as required, even when the path contains optional params like :id?.

This change distinguishes required and optional path params in the type signature so optional params can be omitted while required params remain enforced.

Changes

• add OptionalPathParam<Path> to extract optional path params
• add GeneratePathParams<Path> to model required and optional params separately
• update generatePath to use GeneratePathParams<Path>
• add type tests covering optional path params and splat behavior

Verification

• pnpm typecheck
• npx jest --testPathPattern generatePath

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