chat: connect mistral-nemo.cpp to main chat.cpp
- Add declaration for common_chat_params_init_mistral_nemo to header
- Remove duplicate static function from chat.cpp
- Remove duplicate helpers (format_time, templates_params, foreach_function,
foreach_parameter, apply) now provided by chat-template-internal.h
- Fix format enum to use COMMON_CHAT_FORMAT_MISTRAL_NEMO
The modular parser in chat-syntax/mistral-nemo.cpp now provides the
implementation with PEG parser support.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
