[refactor] 全体的にエラーハンドリング漏れの修正

[Justhiro55]

概要

エラーハンドリングを中心に，全体的に見直して修正しました．
使われていなかった戻り値のエラー処理を追加して，処理が途中で失敗しても気付きやすくしました．
追加で，CIも追加しました

変更点

• utils.Validate や auth.IssueUserToken のエラー処理を追加
• HTTPレスポンスやエラーメッセージの見直し
• workID の取得を chi.URLParam に変更
• commentRepositoryImpl の戻り値型を明示
• Usecace を UseCase に修正（タイポ修正）
• userID.(string)の入力値にnil等が入った際にパニックが発生するケースの修正
• CIの追加：ビルドできるかの最低限

[Copilot]

Pull Request Overview

This PR refactors various components of the codebase to improve error handling across controllers, use cases, and infrastructure layers. Key changes include adding proper error handling for multipart form parsing, UUID generation, JWT token issuance, and request validations, as well as fixing typos in function names and log messages.

Reviewed Changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
file-server/pkg/controller/file.go	Updated error handling and response formatting in file uploads
app/usecase/userinfo.go	Fixed typo in NewUserinfoUseCase function name
app/usecase/comment.go	Fixed typo in NewCommentUseCase function name and improved UUID error handling
app/usecase/auth.go	Added error checks for JWT token generation
app/interfaces/server.go	Fixed typo in instantiating use cases and handlers
app/interfaces/handler/*.go	Replaced error handling via utils.Validate and updated response handling
app/infrastructure/comment.go	Updated NewCommentRepository return type for improved type clarity
app/configs/conn.go	Fixed typo in log message for failed database connection

[Copilot]

Consider adding an explicit separator (e.g., '/') between the UUID and file.Filename to ensure that the generated URL is always correctly formatted, especially when file.Filename may not start with a '/'.

Suggested change

	urlName := fmt.Sprintf("http://localhost:3004/%s%s", uuID, file.Filename)
	sanitizedFilename := file.Filename
	if len(sanitizedFilename) > 0 && sanitizedFilename[0] == '/' {
	sanitizedFilename = sanitizedFilename[1:]
	}
	urlName := fmt.Sprintf("http://localhost:3004/%s/%s", uuID, sanitizedFilename)

[static-fuji]

LGMT