Reduce PORT parsing boilerplate

[raeperd]

Summary

• store parsed PORT as uint64 to assign ParseUint directly
• remove unnecessary conversion in server startup logging

Test

• go test ./...

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 9e30f2e4-9fec-45b7-85ae-3ed05c05d4a2

📥 Commits

Reviewing files that changed from the base of the PR and between 4eb0324 and 7c5070c.

📒 Files selected for processing (1)

• main.go

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch refactor/use-errors-is

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[coveralls]

coverage: 79.739%. remained the same — refactor/use-errors-is into main