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### What problem does this PR solve? This PR fixes missing metadata on documents synced from the Moodle connector, especially for **Book** modules. Background: - Moodle Book metadata includes fields like `chapters`, which is a `list[dict]`. - During metadata normalization in `DocMetadataService._split_combined_values`, list deduplication used `dict.fromkeys(...)`. - `dict.fromkeys(...)` fails for unhashable values (like `dict`), causing metadata update to fail. - Result: documents were imported, but metadata was not saved for affected module types (notably Books). What this PR changes: - Replaces hash-based list deduplication with `dedupe_list(...)`, which safely handles unhashable list items while preserving order. - This allows Book metadata (and other complex list metadata) to be persisted correctly. ### Type of change - [x] Bug Fix (non-breaking change which fixes an issue) - [ ] New Feature (non-breaking change which adds functionality) - [ ] Documentation Update - [ ] Refactoring - [ ] Performance Improvement - [ ] Other (please describe): Contribution during my time at RAGcon GmbH.