fix(hz): router import error for 'api.service_gen_dir'

[FGYFFFF]

What type of PR is this?

fix

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(Optional) Translate the PR title into Chinese.

修复指定 'api.service_gen_dir' 时的路由 import 错误的问题

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

en: fix router import error for 'api.service_gen_dir'
zh(optional): 修复指定 'api.service_gen_dir' 时的路由 import 错误的问题
当我们如下定义 IDL 的时候，生成的 handler 路径与 'api.service_gen_dir' 一致；在生成路由的没有去解析这个路径的 import，导致生产的 import 路径有问题

service Hertz2 {
    Resp Method1(1: MultiTypeReq request) (api.get="/a/b/c");
}(

     api.service_gen_dir="/handle2/ss/ss/trt"
 )

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.80%. Comparing base (9162dd1) to head (164973c).
Report is 11 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1127      +/-   ##
===========================================
+ Coverage    82.75%   82.80%   +0.05%     
===========================================
  Files           98       98              
  Lines        10044    10062      +18     
===========================================
+ Hits          8312     8332      +20     
+ Misses        1241     1240       -1     
+ Partials       491      490       -1     

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