Move fonts / assets definition from main/boards to CMakeLists.txt

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This pull request refactors board initialization code across multiple files to simplify asset and font management. The key changes remove board-specific font declarations and dynamic asset loading from board classes, centralizing asset handling and reducing redundancy. Additionally, a new configuration option is introduced to control flashing default assets during the build process.

Configuration changes:

• Added a new FLASH_DEFAULT_ASSETS config option in main/Kconfig.projbuild to enable or disable automatic downloading and flashing of default assets to the assets partition during build.

Board code simplification:

• Removed board-specific font declarations (LV_FONT_DECLARE) from all board source files, reducing duplication and making font management more centralized. [1] [2] [3] [4] [5] [6] [7] [8] [9]
• Updated SpiLcdDisplay initialization in all boards to remove explicit font lists from constructor arguments, further decoupling font loading from board definitions. [1] [2] [3] [4] [5] [6] [7] [8] [9]

Asset management changes:

• Removed the GetAssets() override and dynamic asset loading from all board classes, centralizing asset management and simplifying board logic. [1] [2] [3] [4] [5] [6] [7] [8] [9]

General code cleanup:

• Removed unused blank lines and improved code formatting in several board files for better readability. [1] [2] [3] [4] [5] [6]

These changes make asset and font handling more maintainable and reduce the complexity of individual board implementations.