Pull request overview

This PR refactors the VRAM detection logic to standardize memory reporting using ceiling values in GB (integers) instead of rounded floats, improving consistency across different device types.

Changes:

• Replaced _gb() method with _ceil_gb() that returns integer GB values using math.ceil()
• Renamed human-readable fields (allocated_human, reserved_human) to consistent naming (allocated_vram_gb, reserved_vram_gb)
• Refactored Docker/CPU fallback logic to execute after all device-specific checks instead of within the try block

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