refactor: Move recipe generator to cook/ directory and fix flattening bugs

- Move recipe-generator/ to cook/ for cleaner structure

- Fix ksflatten-relative path conversion to handle all %include paths

- Fix validation exit code to only fail on actual errors

- All recipes now generate and flatten successfully via make all

cook/ingredients/storage/encrypted.ks

@@ -0,0 +1,8 @@
+# Encrypted storage configuration
+
+zerombr # Destroy all the contents of disks with invalid partition tables or other formatting unrecognizable to the installer
+clearpart --all --initlabel # Erase all partitions and Initializes the disk label to the default for the target architecture
+
+part /boot/efi --fstype="efi" --size=512 --fsoptions="umask=0077,shortname=winnt" --label=efi # Creates a 512 MiB EFI system partition
+part /boot --fstype="ext4" --size=2048 --label=boot # Creates a 2048 MiB ext4 boot partition
+part / --fstype="ext4" --grow --label=root --mkfsoptions="-O encrypt,fast_commit" --encrypted --passphrase= # Create a single encrypted root partition with the remaining space.

cook/ingredients/storage/standard.ks

@@ -0,0 +1,8 @@
+# Standard storage configuration
+
+zerombr # Destroy all the contents of disks with invalid partition tables or other formatting unrecognizable to the installer
+clearpart --all --initlabel # Erase all partitions and Initializes the disk label to the default for the target architecture
+
+part /boot/efi --fstype="efi" --size=512 --fsoptions="umask=0077,shortname=winnt" --label=efi # Creates a 512 MiB EFI system partition
+part /boot --fstype="ext4" --size=2048 --label=boot # Creates a 2048 MiB ext4 boot partition
+part / --fstype="ext4" --grow --label=root --mkfsoptions="-O encrypt,fast_commit" # Create a single root partition with the remaining space