- Introduced `NormalizeClaudeToolInputSchema` in `util` package to standardize tool input schemas for compatibility with Claude. - Replaced local `normalizeClaudeToolInputSchema` implementations in translator functions with the new utility method. - Improved handling of schema validation, union elimination, and property merging. - Removed redundant code in response and chat-completions translators, streamlining schema normalization logic. Closes: #4428