refactor: rename fragments directory to ingredients and update all references

- Directory rename: fragments/ → ingredients/ (54 .ks files)
- Updated all Python scripts:
  * tests/integration/conftest.py - fixture renames
  * tests/integration/test_integration.py - constant and path updates
  * tests/test_recipe_generator.py - updated test assertions
  * recipe-generator/validators.py - updated comments and error messages
  * recipe-generator/recipe_generator.py - updated comment
- Updated all YAML files:
  * recipe-generator/recipe_templates.yaml - 66 path references
  * .gitea/workflows/validate-fragments.yaml → validate-ingredients.yaml
  * .gitea/workflows/test-generation.yaml - path patterns
- Updated scripts:
  * bin/ksflatten-relative - updated path detection
- Updated test file:
  * tests/integration/test_fragments.py → test_ingredients.py
- Updated documentation:
  * DEVELOPMENT.md - simplified references
  * DEVELOPMENT_QUICK.md - updated examples
  * tests/container/README.md - test references
- Regenerated all recipes (16 files) with ingredient paths
- Updated test fixtures (7 files)
- All integration tests pass (5/5)
- All unit tests pass (29/31 - 2 pre-existing failures unrelated)

ingredients/initial-setup/gnome/config.ks

@@ -0,0 +1,25 @@
+# Initial setup - GNOME desktop mode
+
+firstboot --enable # Initial Setup will start after the first reboot
+
+%packages --exclude-weakdeps # Beginning of the packages section. Excludes weak package dependencies.
+
+# TO BE TESTED -> initial-setup-gui # Graphical user interface for the initial-setup utility
+# TO BE TESTED -> initial-setup-gui-wayland-generic.x86_64 # Run the initial-setup GUI in Wayland
+gnome-initial-setup # Add GNOME initial setup too to let user create local account.
+
+%end # End of the packages section
+
+# %post --nochroot --log=/mnt/sysimage/root/initial-setup-gnome.log # Beginning of %post section. Those commands are executed outside the chroot environment. Add logging.
+# 
+# truncate -s 0 /mnt/sysimage/usr/share/gnome-initial-setup/vendor.conf # remove content of vendor.conf so that all options are made available
+# 
+# ## Append lines to existing vendor.conf file, so that options are skipped upon reboot
+# cat >> /mnt/sysimage/usr/share/gnome-initial-setup/vendor.conf<< EOF
+# [pages]
+# skip=privacy
+# [goa]
+# providers=local-first!
+# EOF
+# 
+# %end # End of the %post section