fix: skip hosts entries for domains managed by other tools

[GeiserX]

Summary

• When writing to /etc/hosts, VPN Bypass now checks if a domain already exists outside its VPN-BYPASS-MANAGED block
• If another tool (AgentTap, Pi-hole, etc.) already manages that domain, VPN Bypass skips it to avoid conflicts
• Prevents VPN Bypass from overriding other tools' DNS interception entries

Test plan

• Configure VPN Bypass with domains that overlap with another hosts-managing tool
• Verify overlapping domains are skipped in the VPN-BYPASS-MANAGED block
• Verify non-overlapping domains are still written normally
• Verify cleanup on quit still works correctly

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📥 Commits

Reviewing files that changed from the base of the PR and between 0733c66 and 7833dbe.

📒 Files selected for processing (1)

• Helper/HelperTool.swift

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/hosts-collision-detection

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