Rename rbos → redbear everywhere, add redbear-info system tool

Replace all 'rbos'/'RBOS' references with 'redbear'/'Red Bear OS'
across the build system, scripts, docs, and configs. Renamed files:
  rbos.ipxe → redbear.ipxe
  assets/rbos-icon.png → assets/redbear-icon.png
  recipes/system/rbos-info → recipes/system/redbear-info

Added redbear-info: a system tool that enumerates all Red Bear OS
custom components, checks runtime availability via scheme paths and
binary presence, and prints status/test info. Supports --verbose,
--json, and --test output modes. Zero external dependencies.

Cargo.toml

@@ -1,5 +1,5 @@
 [package]
-name = "rbos_cookbook"
+name = "redbear_cookbook"
 version = "0.1.0"
 authors = ["Jeremy Soller <jackpot51@gmail.com>"]
 edition = "2024"
@@ -8,7 +8,7 @@ default-run = "repo"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [[bin]]
-name = "cookbook_rbos_redoxer"
+name = "cookbook_redbear_redoxer"
 path = "src/bin/cookbook_redoxer.rs"
 
 [[bin]]