Issue: Python Tools – Missing SQLCipher Encryption Support

### Description
The current Python tools cannot open or process encrypted databases created by the Android app.
Encryption support using SQLCipher has not yet been implemented.

### Tasks
- [ ] Integrate SQLCipher support into both Python tools
- [ ] Implement passphrase/key input handling
- [ ] Add decryption/encryption routines compatible with Android database format
- [ ] Update documentation (usage + troubleshooting)
- [ ] Add tests for encrypted import/export operations

### Priority
High – Required for full cross-platform compatibility

### Affected Components
- `python_import_tool.py`
- `python_export_tool.py`

Read python_import_tool.py and python_export_tool.py first, then review how their database operations must support the Android SQLCipher format. Define the passphrase flow, add tests for encrypted import/export operations, and update the usage and troubleshooting documentation to cover the completed support.

Written by the indexing model from the issue text.