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/core/base.ks

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+# Core base kickstart configuration
+# Common settings for all Phyllome OS installations
+
+text # Kickstart installation in text mode
+poweroff # Shut down the system after a successful installation

cook/ingredients/core/locale.ks

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+# Keyboard, language, and timezone configuration
+
+keyboard --xlayouts='ch (fr)' # Set keyboard layouts for Romandy
+lang en_US.UTF-8 # Set system language to American English. More languages could be supported: --addsupport=cs_CZ,de_DE,en_UK
+timezone Europe/Zurich --utc # Set system timezone to Zurich

cook/ingredients/core/network.ks

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+# Network configuration
+
+network  --onboot=yes --bootproto=dhcp --device=link --activate --hostname=phyllome-alpha # Configure network devices, enable them at boot time device and sets a particular hostname. "link" selects the first device reaching an up state

cook/ingredients/core/security/disabled.ks

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+# Security configuration - disabled mode
+
+rootpw --plaintext 1234 --allow-ssh # Root account is enabled with weak password and allow ssh
+selinux --disabled # Disable SELinux
+firewall --enabled --ssh # Reject incoming connections that are not in response to outbound requests except SSH

cook/ingredients/core/security/enabled.ks

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+# Security configuration - enabled mode
+
+rootpw --lock # No root login from the console
+selinux --enforcing # Set SELinux to enforcing mode
+firewall --enabled # Enable firewall

cook/ingredients/core/services.ks

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+# System services
+
+services --enabled=NetworkManager,systemd-resolved # List of comma-separated systemd services that can be explicitly enabled