Proposal: Integrate standard-schema into react-hook-form core and deprecate individual resolvers

[yslpn]

Proposal: Integrate standard-schema into react-hook-form core and deprecate individual resolvers

Summary

Consider removing all individual resolver packages and keeping only standard-schema resolver, which could be integrated directly into the main react-hook-form library.

Standard Schema: https://standardschema.dev/

Rationale

• Minimal footprint: standard-schema is very lightweight
• Reduced maintenance: Single resolver instead of maintaining multiple packages
• Better DX: No need to install separate resolver packages
• Future-proof: Standard Schema is designed to be a universal validation schema standard

Proposal

1. Remove all specific resolvers (yup, zod, joi, etc.)
2. Integrate standard-schema directly into react-hook-form core
3. Users can use any validation library that supports Standard Schema

Benefits

• Smaller maintenance burden
• Simpler dependency tree
• One standard interface for all validation libraries
• Encourages validation library authors to adopt Standard Schema