Fix boot screen rendering for 0/90/180/270 degree display rotation

[davelee98]

Summary

• Adds OpenDisplay logo to the boot screen rendered from logo_bitmap.h
• Increases max text scale from 2 to 3
• Removes vertical centering from the text block for better layout
• Conditionally compiles logo support — if logo_bitmap.h is missing, the boot logo is disabled at compile time
• added code to render boot screen correctly under various rotation angles.

New files

• src/logo_bitmap.h — XBM-style bitmap of the OpenDisplay logo
• tools/convert_logo.py — helper script to regenerate the bitmap from an SVG
• tools/od_logo.svg — source SVG for the logo

NOTE: od_logo.svg was manually created from the logo svg -- recolored all to black and trimmed canvas to fit
Also need to run convert_logo.py if you change the logo. it creates 3 bitmaps in logo_bitmap.h

Test plan

• Build firmware with logo_bitmap.h present and confirm logo appears on boot screen
• Build firmware without logo_bitmap.h and confirm it compiles cleanly with logo disabled
• Verify boot screen renders correctly under 0°, 90°, 180°, and 270° rotation
• Check text scale-up to 3 renders without clipping

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