[AI] Reorganize files

[sochalewski]

Summary

Reorganizes the repository file layout to make app code, resources, tests, dictionary tooling, samples, and marketing assets easier to navigate.

Changes

• Moves app sources into Scrabbdict/Modules, grouped by app entry point, main Scrabbdict feature, and Settings.
• Moves shared runtime clients from Scrabbdict/Helpers to Scrabbdict/Services.
• Moves bundled assets, localizations, Settings bundle files, and generated dictionaries under Scrabbdict/Resources.
• Renames DAWGWizard to DAWGBuilder and updates the Xcode target, scheme, CI workflow, helper script, and documentation.
• Moves raw dictionary samples from .samples/Files to .samples/RAW.
• Groups tests into DAWG, Features, Snapshots, and Support.
• Moves App Store / ButterKit assets from images to Marketing/AppStore.
• Updates README repository layout, dictionary-generation paths, snapshot paths, .gitignore, and Git LFS attributes.
• Updates the private dictionary submodule pointer and copy phases to use the new DAWG / RAW structure.