feat: Friend CRUD

[Zerohertz]

Chore

• JwtService를 FriendService layer로 이동
• Friend domain test code 개발

[codecov]

Codecov Report

Attention: Patch coverage is 57.14286% with 6 lines in your changes missing coverage. Please review.

Project coverage is 37.39%. Comparing base (b2f7da3) to head (8eb6655).
Report is 1 commits behind head on main.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...ver/domain/friend/controller/FriendController.java	0.00%	5 Missing ⚠️
...om/server/domain/friend/service/FriendService.java	88.88%	1 Missing ⚠️

@@              Coverage Diff              @@
##               main      #36       +/-   ##
=============================================
+ Coverage     23.36%   37.39%   +14.02%     
- Complexity       38       46        +8     
=============================================
  Files            39       39               
  Lines           368      369        +1     
  Branches         17       17               
=============================================
+ Hits             86      138       +52     
+ Misses          282      223       -59     
- Partials          0        8        +8     

Components	Coverage Δ
user	∅ <ø> (∅)

Files with missing lines	Coverage Δ	Complexity Δ
...om/server/domain/friend/service/FriendService.java	58.82% <88.88%> (+58.82%)	6.00 <4.00> (+6.00)
...ver/domain/friend/controller/FriendController.java	7.69% <0.00%> (+2.13%)	1.00 <0.00> (ø)

... and 2 files with indirect coverage changes

---

Continue to review full report in Codecov by Sentry.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update b2f7da3...8eb6655. Read the comment docs.