feat: add a api to get stable tag of app

[CorrectRoadH]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 35 lines in your changes are missing coverage. Please review.

Project coverage is 19.97%. Comparing base (e4612d3) to head (d79f9ed).

Files	Patch %	Lines
route/v2/appstore.go	0.00%	33 Missing ⚠️
service/app.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #162      +/-   ##
==========================================
- Coverage   20.13%   19.97%   -0.17%     
==========================================
  Files          30       30              
  Lines        4336     4371      +35     
==========================================
  Hits          873      873              
- Misses       3318     3353      +35     
  Partials      145      145              

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[sonarqubecloud]

Quality Gate failed

Failed conditions
19.6% Duplication on New Code (required ≤ 3%)

See analysis details on SonarCloud