Add GRUB variants for live and minimal profiles

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

config/redbear-live-full-grub.toml

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+# Red Bear OS Live Full Configuration with GRUB Boot Manager
+# Live ISO for full desktop/session target with installer-native GRUB chainload.
+#
+# Build: make live CONFIG_NAME=redbear-live-full-grub
+
+include = ["redbear-live-full.toml", "redbear-grub.toml"]

config/redbear-live-mini-grub.toml

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+# Red Bear OS Live Mini Configuration with GRUB Boot Manager
+# Live ISO for stripped console/recovery target with installer-native GRUB chainload.
+#
+# Build: make live CONFIG_NAME=redbear-live-mini-grub
+
+include = ["redbear-live-mini.toml", "redbear-grub.toml"]

config/redbear-live-minimal-grub.toml

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+# Red Bear OS Live Minimal Configuration with GRUB Boot Manager
+# Live ISO for minimal console target with installer-native GRUB chainload.
+#
+# Build: make live CONFIG_NAME=redbear-live-minimal-grub
+
+include = ["redbear-live-minimal.toml", "redbear-grub.toml"]

config/redbear-minimal-grub.toml

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+# Red Bear OS Minimal Configuration with GRUB Boot Manager
+# Minimal console/server target with installer-native GRUB chainload.
+#
+# Build: make all CONFIG_NAME=redbear-minimal-grub
+
+include = ["redbear-minimal.toml", "redbear-grub.toml"]