refactor: rename functions for better clarity in tag handler

[CarlJi]

• Rename buildEnhancedIssuePrompt to buildIssueCodePrompt
• Rename generateCodeImplementation to callAIAndGenerateCode
• Rename buildCodePrompt to buildAIPromptForCode
• Update function comments to match new names

[CarlJi]

🤖 代码审查结果

My comprehensive code review is complete! This is a well-executed refactoring PR that improves code clarity through better function naming. The changes are clean, complete, and maintain full functionality while making the code more self-documenting and easier to understand.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 5 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (main@3df13b2). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
internal/modes/tag_handler.go	0.00%	5 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #337   +/-   ##
=======================================
  Coverage        ?   12.83%           
=======================================
  Files           ?       53           
  Lines           ?    11081           
  Branches        ?        0           
=======================================
  Hits            ?     1422           
  Misses          ?     9511           
  Partials        ?      148           

Flag	Coverage Δ
unittests	12.83% <0.00%> (?)

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