Introduce a project-wide ESLint configuration with TypeScript/React rules (including a ban on direct useEffect and inline style object literals) and file-specific overrides. Update index.html to add theme-color meta tags and preload Google fonts. Expand package.json with new scripts (lint, typecheck, validate, extended test commands) and bump/add dev/dependencies for testing, linting, Radix UI, TanStack and tooling. Add many new components and tests (BrandMark, SetupSidebar, compose-builder UI and ServiceForm tabs, VPN tab, CodeMirror runtime, ThemeProvider, template UI and tests, icons), update existing components (CodeEditor, ConversionDialog, Header, Footer, MetaTags, SidebarUI) and hooks/routes. Add YAML generator and related utils, validation schemas, and numerous unit tests and fixtures. Misc: update tsconfig/vite config and styles.
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