fix: add swagger annotation, exception handling controller->service

[ssoheeh]

Features

• oauth
  • oauth controller refactor (resolves: refactor: user & oauth #20)

Chore

• oauth controller swagger annotation 추가
• exception handling controller -> service layer 에서 처리

[codecov]

Codecov Report

Attention: Patch coverage is 2.38095% with 41 lines in your changes missing coverage. Please review.

Project coverage is 24.86%. Comparing base (0720497) to head (c254410).
Report is 1 commits behind head on main.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...server/domain/oauth/service/OAuthLoginService.java	2.85%	34 Missing ⚠️
.../domain/oauth/controller/OAuthLoginController.java	0.00%	7 Missing ⚠️

@@            Coverage Diff            @@
##               main      #34   +/-   ##
=========================================
  Coverage     24.86%   24.86%           
- Complexity       39       40    +1     
=========================================
  Files            38       39    +1     
  Lines           362      366    +4     
  Branches         18       17    -1     
=========================================
+ Hits             90       91    +1     
- Misses          272      275    +3     

Components	Coverage Δ
user	∅ <ø> (∅)

Files with missing lines	Coverage Δ	Complexity Δ
.../domain/oauth/controller/OAuthLoginController.java	7.14% <0.00%> (+4.92%)	1.00 <0.00> (ø)
...server/domain/oauth/service/OAuthLoginService.java	2.85% <2.85%> (ø)	1.00 <1.00> (?)

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