Dev 44913f8075 feat(02-04): implement CsvExportService with Merge-PermissionRows port ...

- GroupBy (Users, PermissionLevels, GrantedThrough) to merge duplicate entries
- Pipe-joins URLs and Titles for merged rows
- RFC 4180 CSV escaping: all fields double-quoted, internal quotes doubled
- WriteAsync uses UTF-8 with BOM for Excel compatibility
- All 3 CsvExportServiceTests pass

2026-04-02 13:58:39 +02:00

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