Fix: CSV export file missing IP column

[KingYes]

✨ PR Description

1. Problem & Context

CSV exports were missing the IP column entirely. The fix ensures IP data is included in exports when the setting permits collection, addressing data completeness in audit logs.

2. What Changed (Where)

• class-aal-export.php: Added add_export_ip_column() private method that conditionally inserts IP column after source column (respecting IP collection settings)
• test-export.php: New test suite with 5 cases covering IP column insertion, omission, and fallback positioning

3. How It Works

When exporting, the code retrieves columns from the list table, then calls add_export_ip_column() which:

1. Returns early if IP collection is disabled ('no-collect-ip')
2. Iterates columns, inserting IP after 'source' key if present
3. Appends IP to end if source column absent (fallback)

Existing prep_row() already populates $row['ip'] from $item->hist_ip, so no data flow changes needed.

4. Risks

Low risk. Settings check prevents exporting when collection disabled. Column insertion is append-only (doesn't mutate existing columns). Test coverage validates three placement scenarios, though integration test with actual CSV generation would strengthen confidence.

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