chore: reorganize snippets into subdirectories
- move root gitignores into gitignores/ subdirectory - add gitignores for dart, dotnet, go, gradle, java, jetbrains, maven, nextjs, node, sublimetext, vscode, windows, xcode - add root .gitignore excluding .claude/settings.local.json - add empty README.md and licences/ placeholders (Apache, MIT, Mozilla)
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