feat: Friend CRUD

[Zerohertz]

Features

• friend
  • 기존 ERD와 같이 friend_request, friend_list로 나누어 crud (resolves: feat: Controller 추가 #41)
• user
  • 사용자 조회 시 thumbnail 포함

[codecov]

Codecov Report

Attention: Patch coverage is 40.27778% with 43 lines in your changes missing coverage. Please review.

Project coverage is 27.68%. Comparing base (2b82e6b) to head (c799b33).

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...om/server/domain/friend/service/FriendService.java	41.07%	26 Missing and 7 partials ⚠️
...ver/domain/friend/controller/FriendController.java	0.00%	5 Missing ⚠️
...com/server/domain/friend/entity/FriendRequest.java	0.00%	3 Missing ⚠️
.../server/domain/friend/dto/GetFriendListOutDto.java	0.00%	1 Missing ⚠️
.../com/server/global/error/code/FriendErrorCode.java	0.00%	1 Missing ⚠️

@@             Coverage Diff              @@
##               main      #44      +/-   ##
============================================
- Coverage     28.51%   27.68%   -0.84%     
- Complexity       49       50       +1     
============================================
  Files            48       51       +3     
  Lines           512      531      +19     
  Branches         22       21       -1     
============================================
+ Hits            146      147       +1     
- Misses          358      376      +18     
  Partials          8        8              

Components	Coverage Δ
user	∅ <ø> (∅)

Files with missing lines	Coverage Δ	Complexity Δ
...rver/domain/friend/dto/GetFriendRequestOutDto.java	100.00% <100.00%> (ø)	1.00 <1.00> (?)
...va/com/server/domain/friend/entity/FriendList.java	0.00% <ø> (ø)	0.00 <0.00> (?)
...om/server/domain/friend/enums/FriendListState.java	100.00% <100.00%> (ø)	1.00 <1.00> (?)
...server/domain/friend/enums/FriendRequestState.java	100.00% <100.00%> (ø)	1.00 <1.00> (?)
.../com/server/domain/friend/mapper/FriendMapper.java	100.00% <ø> (ø)	1.00 <0.00> (ø)
.../main/java/com/server/domain/user/entity/User.java	81.81% <ø> (ø)	2.00 <0.00> (ø)
.../server/domain/friend/dto/GetFriendListOutDto.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
.../com/server/global/error/code/FriendErrorCode.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...com/server/domain/friend/entity/FriendRequest.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
...ver/domain/friend/controller/FriendController.java	6.66% <0.00%> (-1.03%)	1.00 <0.00> (ø)
... and 1 more

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