Restore legacy fallback for all template init functions
Ensure all template initialization functions follow the same
use_legacy_parsers pattern for safe PEG migration:
- common_chat_params_init_minimax_m2
- common_chat_params_init_qwen3_coder_xml
- common_chat_params_init_kimi_k2
- common_chat_params_init_apriel_1_5
- common_chat_params_init_xiaomi_mimo
- common_chat_params_init_glm_4_5
- common_chat_params_init_seed_oss
- common_chat_params_init_nemotron_v3
- common_chat_params_init_ministral_3
Also restore the corresponding legacy parser functions in
chat-parser.cpp and update the switch statement to call them.
This allows reviewers to trivially verify safety when the
legacy flag is set, as all legacy code paths are preserved
from master.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
