[AsyncEngine Refactor 2/N] Remove deprecates from chat template

[lvhan028]

Motivation

Removes deprecated chat templates as part of the AsyncEngine refactor series.

Modification

• Replace best_match_model with get_chat_template cleaner chat template
• Remove deprecated and obsolete chat template name constants
• Remove the lmdeploy list CLI command for listing chat templates

[Copilot]

Pull request overview

This PR removes deprecated chat template functionality as part of the AsyncEngine refactor series. The main changes consolidate chat template handling by replacing the best_match_model function with a new get_chat_template function and removing deprecated template names and the CLI list command.

• Replaced best_match_model() with get_chat_template() for cleaner chat template resolution
• Removed deprecated and obsolete chat template name constants
• Removed the lmdeploy list CLI command for listing chat templates

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
lmdeploy/model.py	Removed deprecated chat template name constants and replaced best_match_model() with get_chat_template() function that provides a cleaner API for template resolution
lmdeploy/serve/async_engine.py	Updated to use get_chat_template() and simplified parameter type hints for backend config methods
lmdeploy/cli/cli.py	Removed the list subcommand and its parser that was used to display supported chat template names
tests/test_lmdeploy/test_model.py	Removed tests for deprecated best_match_model() function and simplified remaining tests to directly use template names
tests/test_lmdeploy/test_vl/test_hf_chat_template.py	Simplified to directly use 'hf' chat template instead of calling best_match_model()
tests/test_lmdeploy/test_vl/test_nonhf_chat_template.py	Simplified to directly use 'hf' chat template instead of calling best_match_model()

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[RunningLeon]

LGTM