[feat] #118 Add port request table

[kwdahun]

🌱 관련 이슈

• close : [feat] Add port usage table per request (PortRequests table) #118

[Copilot]

Pull Request Overview

This PR adds a new entity for managing port requests in the admin backend system. The implementation creates a database table to track port allocation requests with associated metadata.

• Introduces PortRequests entity with port number validation and usage tracking
• Establishes relationship with existing Request entity through foreign key
• Implements standard JPA entity patterns with Lombok annotations

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[Copilot]

Port number validation allows port 1-1023 which are system/well-known ports typically reserved for system services. Consider using @min(1024) to restrict to user/dynamic ports unless system ports are intentionally required.

Suggested change

	@Column(name = "port_number", nullable = false, unique = true)
	@Min(1)
	@Min(1024)

[saokiritoni]

lgtm

[saokiritoni]

다른 id 값 형식이랑 맞춰야 해서 길어지더라도 portRequestId 로 바꾸는 게 좋을 거 같아요!