fix(hz): service gen dir failed

[FGYFFFF]

What type of PR is this?

fix

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修复 hz 在 "service_gen_dir" 注解下，生成的 router.go 缺少 import 的问题

(Optional) More detailed description for this PR(en: English/zh: Chinese).

en: fix a missing import in router.go generated by hz under the "service_gen_dir" annotation.
zh(optional): 修复 hz 在 "service_gen_dir" 注解下，生成的 router.go 缺少 import 的问题

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (119a744) 82.49% compared to head (fe5d5a2) 82.51%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1044      +/-   ##
===========================================
+ Coverage    82.49%   82.51%   +0.01%     
===========================================
  Files           98       98              
  Lines        10011    10011              
===========================================
+ Hits          8259     8261       +2     
+ Misses        1255     1254       -1     
+ Partials       497      496       -1     

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