- Implemented `excel_export.py` for generating library item exports in Excel format.
- Created `pdf_export.py` for generating audit reports compliant with DIN 5008 standards, including detailed event tables and signature blocks.
- Developed `generate_user.py` for interactive user creation with validation for usernames and passwords.
- Introduced `module_registry.py` for managing module states and path matching.
- Added a basic `__init__.py` in the `terminplaner` module for initialization.
- Introduced a new audit logging system that creates a tamper-evident chain of events in MongoDB.
- Added functions for appending audit events, ensuring index integrity, and verifying the audit chain.
- Implemented soft-delete functionality for inventory and borrowing records to comply with GoBD regulations.
- Added UI components for displaying invoice corrections and audit dashboard, including mismatch reporting.
- Created a CLI utility for verifying the integrity of the audit chain.
- Enhanced invoice management by preventing overwrites and allowing correction entries with reasons and optional deltas.
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