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feat(csp): add weight field to authentication response

Add weight field to AuthResponse structure and include it in the
sign-and-respond flow. This allows clients to receive the weight value
directly in the authentication response alongside the signature.

Also refactor error handling in signing functions by replacing generic
ErrStorageFailure with more specific ErrSign error type for better
error classification and debugging.

Changes:
- Add Weight field to AuthResponse struct with proper JSON and Swagger tags
- Include weight in signAndRespond HTTP response
- Replace ErrStorageFailure with ErrSign in prepareSaltedKeySigner and
  finishSaltedKeySigner functions
- Update Swagger documentation to reflect new weight field