Extract all inline database type checks (schema-aware, pagination style,
feature support sets, etc.) into a single source of truth. Adding a new
database type now requires updating only one file instead of 15+.
- Add GaussDB/openGauss support via ODBC (resolves#106)
- Use pg_catalog queries instead of information_schema for compatibility
- Share ODBC environment across drivers with auto ODBCSYSINI detection
- Fix ODBC error message false positive on "Driver" keyword match
- Merge connection dialog categories into a single flat list
- Remove duplicate DDL button from data grid footer
Connect to DM8 databases using the odbc-api crate with unixODBC.
Includes schema browsing, query execution, DDL generation,
and full frontend integration with download link to DM ODBC driver.