feat(website): add comparison pages for sources, players and editions

Publish /compare/ with three pages answering the choices the app asks
users to make: M3U vs Xtream Codes vs Stalker portal, the built-in web
players vs embedded MPV vs external MPV/VLC, and the desktop app vs the
self-hosted browser version. Each opens with a one-paragraph verdict,
carries a feature matrix whose cells are yes, no or a qualifier, and
emits WebPage / FAQPage / BreadcrumbList JSON-LD — not
SoftwareApplication, because guidance is not a product listing.

These compare IPTVnator's own options against each other rather than
naming other products, so every cell is checkable against this
repository. Pages that name competitors remain phase 3's open half; the
plan now records what has to be decided first.

A registry in src/lib/comparisons.ts drives the hub, the switcher and
the tests. The header gains a Compare entry and the features hub links
across. tools/testing/website-compare-pages.test.mjs checks canonical
URLs, the verdict block, the table, schema, cross-links and sitemap
entries.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

CLAUDE.md

@@ -330,7 +330,7 @@ This is an Nx monorepo with the following structure:
 - **apps/electron-backend-e2e** - Playwright E2E tests against the Electron app
 - **apps/stalker-mock-server** - Mock Stalker/Ministra portal for dev and E2E
 - **apps/xtream-mock-server** - Mock Xtream Codes API for dev and E2E
-- **apps/website** - Astro + Tailwind landing page, blog (guides carry `faq:` frontmatter → FAQPage JSON-LD), per-OS download landing pages (`/download/`, `/download/{windows,macos,linux}/`) and feature landing pages (`/features/`, registry in `src/lib/features.ts`); direct asset links are resolved at build time from the GitHub Releases API with a `package.json` fallback (`src/lib/downloads.ts`, see `apps/website/README.md`)
+- **apps/website** - Astro + Tailwind landing page, blog (guides carry `faq:` frontmatter → FAQPage JSON-LD), per-OS download landing pages (`/download/`, `/download/{windows,macos,linux}/`) feature landing pages (`/features/`, registry in `src/lib/features.ts`) and comparison pages (`/compare/`, registry in `src/lib/comparisons.ts`, comparing IPTVnator's own options rather than other products); direct asset links are resolved at build time from the GitHub Releases API with a `package.json` fallback (`src/lib/downloads.ts`, see `apps/website/README.md`)
 - **libs/** - Shared libraries:
     - **epg/data-access** - EPG services, runtime bridge, program normalization
     - **m3u-state** - NgRx state management for M3U playlists