docs(docs): refresh packages guide for 4.1 reality (#2281)

* docs(docs): update packages guide for accuracy and 4.1 reality

Closes #2244.

The packages.mdx guide was shipped before several key pieces landed: the
`wheels packages` CLI, the wheels-i18n and wheels-seo-suite conversions
to 4.0 format, and before the `view` mixin-target claim was noticed as
unsupported. This refresh brings the guide into sync with reality.

Substantive changes to `packages.mdx`:

- Remove `view` and `service` from the `provides.mixins` target list —
  neither is in PackageLoader's allowlist
  (application,dispatch,controller,mapper,model,base,sqlserver,mysql,
  postgresql,h2,test plus the specials global/none). Explain that
  `controller` already covers views since Wheels views run in the
  controller's variables scope.
- Replace the per-method override example's `mixin="view"` with realistic
  `mixin="model"` and `mixin="none"` examples.
- Replace "Until Wheels 4.1 lands / gh repo clone as interim" with the
  real `wheels packages install|list|search|show|update|remove|registry`
  CLI that shipped in #2276.
- Update first-party package list: drop "wheels-i18n is planned for
  conversion" (shipped as v2.0.0) and add both wheels-i18n and
  wheels-seo-suite to the list of shipped packages.
- Add dedicated sections: Service providers (register/boot lifecycle
  with ServiceProviderInterface) and Lazy loading (the `lazy: true`
  manifest flag for service-only packages).
- Rewrite the testing section: replace the broken `directory=vendor.*`
  URL-param pattern (tracked by #2280) with a BDD spec example and a
  caution box pointing at the issue, plus guidance to rely on
  per-package CI.
- Rewrite the publishing section with the actual registry submission
  checklist and flow (public repo, v<version> tag, file-type allowlist,
  10 MB cap, PR title, mirror workflow bot-commits tarball+sha256).
- Add a `lazy` field entry and mention `dependencies` ordering more
  explicitly in the manifest reference.

Smaller fixes:

- `glossary.mdx`: "Mixin target" entry no longer lists the non-existent
  `view` target.
- `upgrading/3x-to-4x.mdx`: update `mixin="view"` annotation example to
  `mixin="model"` / `mixin="none"`.
- `CLAUDE.md`: add a cross-link to the public packages guide and to
  wheels-packages/CONTRIBUTING.md, and refresh the first-party package
  list to include wheels-i18n and wheels-seo-suite.

No code changes — docs and instructions only.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* test(docs): refresh packages-index visual baseline

The /packages landing page now renders wheels-i18n and wheels-seo-suite
tiles alongside the original four first-party packages (shipped earlier
today via wheels-dev/wheels-packages#3 and #4, closes #2268 and #2267).

The existing baseline predates those registry entries, so visual-regression
reports 34,529 pixels differ. Diff reviewed — only the two new package
tiles; layout, typography, header, and existing tiles unchanged.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: bpamiri

CLAUDE.md

@@ -336,12 +336,16 @@ Strategies: `fixedWindow` (default), `slidingWindow`, `tokenBucket`. Storage: `m
 
 Optional first-party modules are distributed as standalone repositories and installed into `vendor/<name>/`. The framework auto-discovers `vendor/*/package.json` on startup via `PackageLoader.cfc` with per-package error isolation.
 
-Four first-party packages live in standalone repos under `wheels-dev/`, indexed by the `wheels-dev/wheels-packages` registry:
+Public author-facing guide: [Packages](web/sites/guides/src/content/docs/v4-0-0-snapshot/digging-deeper/packages.mdx) — manifest fields, mixin targets, lifecycle, service providers, lazy loading, testing, publishing flow. Submission workflow: [wheels-packages/CONTRIBUTING.md](https://github.com/wheels-dev/wheels-packages/blob/main/CONTRIBUTING.md).
+
+Six first-party packages live in standalone repos under `wheels-dev/`, indexed by the `wheels-dev/wheels-packages` registry:
 
 - `wheels-dev/wheels-sentry` — error tracking
 - `wheels-dev/wheels-hotwire` — Turbo/Stimulus
 - `wheels-dev/wheels-basecoat` — UI components
 - `wheels-dev/wheels-legacy-adapter` — 3.x → 4.x compatibility shims
+- `wheels-dev/wheels-i18n` — internationalization (JSON or DB-backed translations, pluralization)
+- `wheels-dev/wheels-seo-suite` — SEO tooling (meta tags, Open Graph, sitemaps, robots.txt, debug panel)
 
 ```
 vendor/                # Runtime: framework core + installed packages