[refactor] rename lfm template to lfm2 and add LFM 2.5 to README

[vovanphuc]

Summary

• Rename lfm template to lfm2 for consistency with the vision template lfm2_vl
• Add LFM 2.5 (VL) models to the supported models table in README

Changes

Template Renaming

• template.py: Renamed template from lfm to lfm2, updated tool_format references
• tool_utils.py: Renamed LFM_TOOL_PROMPT → LFM2_TOOL_PROMPT, LFMToolUtils → LFM2ToolUtils
• constants.py: Updated model registration to use template="lfm2"
• test_formatter.py: Renamed all test_lfm_* functions to test_lfm2_*

Documentation

• Added LFM 2.5 (VL) to supported models table in both README.md and README_zh.md

Motivation

The vision template was named lfm2_vl while the text template was named lfm. This inconsistency could cause confusion. Renaming to lfm2 creates a consistent naming convention:

• Text models: lfm2
• Vision models: lfm2_vl

Checklist

• Template renamed from lfm to lfm2
• Tool utilities class renamed accordingly
• All tests updated and passing
• README documentation updated
• No remaining "lfm" (without 2) references in codebase

[gemini-code-assist]

Summary of Changes

Hello @vovanphuc, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request refactors the naming convention for the LFM template, changing it from lfm to lfm2. This standardization ensures consistency with the existing lfm2_vl vision template, making the codebase more intuitive and maintainable. The changes involve updating template registrations, tool utility classes, and corresponding test cases. Additionally, the documentation has been enhanced to reflect the support for LFM 2.5 (VL) models.

Highlights

• Template Renaming: The lfm template has been consistently renamed to lfm2 across template.py, tool_utils.py, and constants.py to align with the lfm2_vl vision template, improving naming consistency.
• Tooling Utilities Update: The LFM_TOOL_PROMPT constant and LFMToolUtils class in tool_utils.py have been updated to LFM2_TOOL_PROMPT and LFM2ToolUtils respectively, reflecting the new template name.
• Test Suite Refactoring: All relevant test functions in test_formatter.py were renamed from test_lfm_* to test_lfm2_* and updated to use the new lfm2 template name, ensuring test coverage for the refactored components.
• Documentation Update: The README.md and README_zh.md files have been updated to include LFM 2.5 (VL) models in the supported models table, providing up-to-date information for users.

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[hiyouga]

LGTM

[gemini-code-assist]

Code Review

This pull request is a straightforward refactoring to rename the lfm template to lfm2 for better consistency with the lfm2_vl vision template. The changes are applied consistently across template definitions, tool utilities, model registration, and tests. Additionally, the README files have been updated to include the LFM 2.5 models. The changes are well-motivated and correctly implemented. I've included one minor suggestion to improve code readability in a test file.