- The `tag_name_validator` function, responsible for validating tag names, has been removed. Tag names are no longer restricted by any validation checks, allowing for unrestricted input (according [DCAT-AP](https://www.dcat-ap.de/def/dcatde/2.0/spec/#datensatz-schlagwort)).
- Removed `ckanext.odsh.upload_formats` configuration variable. Upload formats are now populated by EU-approved file formats.
- Removed subject mappings and other subject related code used in Transparenzportal SH (TPSH).
### Changed
- Reorganized default mapping and resource files for improved organization and maintenance. Mapping and config files (e.g., file formats) are now located in `ckanext/odsh/resources/`.
- Refactor distribution/resource editing form to replace free-text format field with select field populated by EU-approved file formats.
- Reorganized tests and helper TPSH specific code
- Migrated TPSH helpers to `helpers.py`.
- Moved TPSH tests to `tests/` and legacy tests to `tests_wip`.
