애플리케이션 배포시 초기화 스크립트 적용

[dolong2]

Description

• 애플리케이션 배포시에 초기화 스크립트를 수행하는 로직을 추가합니다.

[coderabbitai]

A summary of the changes CodeRabbit can apply:

• Implement an automatic initialization-script execution system: add ExecInitialScriptService.kt and ExecInitialScriptServiceImpl.kt plus docs/INITIALIZATION_SCRIPTS.md; modify RunContainerServiceImpl.kt to trigger script execution after container start, add initialScripts: List to CreateApplicationReqDto.kt and UpdateApplicationReqDto.kt, and update CreateApplicationUseCase.kt and UpdateApplicationUseCase.kt to persist scripts (stored in application_initial_script_entity) so they run sequentially via Docker exec with logging, non-blocking behavior, and tolerant error handling.

• Add an application "initialization scripts" feature that stores scripts in the database and automatically executes them after container start: add docs/INITIALIZATION_SCRIPTS.md; add ExecInitialScriptService.kt and ExecInitialScriptServiceImpl.kt; update RunContainerServiceImpl.kt to call the executor after successful start; add initialScripts field to CreateApplicationReqDto.kt and UpdateApplicationReqDto.kt; and update CreateApplicationUseCase.kt and UpdateApplicationUseCase.kt to handle saving/updating scripts (persisted in application_initial_script_entity), with scripts executed sequentially after a 2s wait, failures logged but non-fatal.

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