Add tests for --allow-host-ports validation

[Mossaka]

Priority: P1 - High

Description

Add unit tests for --allow-host-ports validation:

• Error when used without --enable-host-access
• Valid port format parsing
• Port range parsing (e.g., 3000-3010)

Current Test Coverage

• No validation tests exist for this flag

Acceptance Criteria

• Unit tests added to src/cli.test.ts
• Tests verify error messages match expected text
• All edge cases covered

Files to Modify

• src/cli.test.ts

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