feat: raw framebuffer fallback for fbbootlogd when DRM unavailable

- Add RawFb struct: direct framebuffer rendering via physmap
- Add RawTextScreen: simple text renderer using orbclient font
- Fallback in FbbootlogScheme::new() when V2GraphicsHandle fails
- Reads FRAMEBUFFER_ADDR/WIDTH/HEIGHT/STRIDE from bootloader env
- Scroll via ptr::copy on pixel rows, clear bottom line
- No DRM, no shadow buffer, no GPU required — like MS-DOS text mode
- Add common dependency to fbbootlogd Cargo.toml

recipes/core/kernel/source/src/main.rs

@@ -70,9 +70,6 @@ mod log;
 /// Memory management
 mod memory;
 
-/// NUMA topology
-mod numa;
-
 /// Panic
 mod panic;