Hellbot Hydra print beds

[DevelopmentHellbot]

This pull request adds two new bed images for the following printers:

• Hellbot Hydra
• Hellbot Hydra Plus

These images provide visual representations of the print bed for both machines, improving the user experience when configuring print jobs. This is particularly helpful for visualizing model placement on the actual bed shape and size.

This improves visual feedback and usability in the printer definitions.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Printer definition file(s)
• Translations

How Has This Been Tested?

The updated printer definitions and bed images were tested by:

• Opening both printer definitions in Cura and verifying that the new bed image is rendered correctly.
• Ensuring models can be placed properly on the new bed images without distortion or misalignment.
• Confirming Cura loads without errors using these new files.

Test Configuration:

• Operating System: Windows 11
• Cura version: 5.7.1

Checklist:

• My code follows the style guidelines of this project as described in UltiMaker Meta and Cura QML best practices
• I have read the Contribution guide
• I have commented my code, particularly in hard-to-understand areas
• I have uploaded any files required to test this change