chore(answer): add prompt example for FILE_LIST

[wsxiaoys]

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 61.17%. Comparing base (5242425) to head (7dff244).
Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
...tabby-webserver/src/service/answer/prompt_tools.rs	0.00%	1 Missing ⚠️

❌ Your patch status has failed because the patch coverage (0.00%) is below the target coverage (75.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3893      +/-   ##
==========================================
+ Coverage   61.00%   61.17%   +0.16%     
==========================================
  Files         218      219       +1     
  Lines       26450    26662     +212     
==========================================
+ Hits        16136    16310     +174     
- Misses      10314    10352      +38     

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