* Add BOARD_VENDOR to board configs
* Add BOARD_VENDOR to all board configuration files
- Added BOARD_VENDOR variable to board configuration files
- Using lowercase vendor slugs (e.g., friendlyelec, radxa, xunlong)
- Set 'generic' for boards without clear vendor match
- TV box files (.tvb) excluded as they have no clear vendor
- Enables better board categorization and vendor-specific handling
* Manual adjustements on top of AI matching
* Drop doubled definition and add retroid vendor
- Replace `armbian.list` with `armbian.sources`. This holds the same
information in a newer format, deb822.
- Replace HTTP with HTTPS for Armbian repositories.
