Align full-site docs with current Weaverse SDK and Pilot

[hta218]

Closes #43

#41 has been merged; this branch is synced with the latest main.

Aligns the rest of the documentation site with Weaverse SDK 5.19.1 and the current Pilot architecture:

• Updates onboarding, React Router 7 routing/context, localization, deployment, React 19, and Tailwind 4 guidance.
• Corrects custom-page types, CLI/SDK examples, resource/FAQ claims, runtime environment access, and stale links.
• Preserves explicitly labeled v4/Remix examples as migration context.
• Includes a final Claude/Hermes cross-review pass covering runtime globals, i18next error rendering, current Judge.me integration, multi-project routing, editor props/ref forwarding, migration snippets, Docker runtime bindings, and FAQ accuracy.

Validation:

• git diff --check
• mint validate
• mint broken-links --check-anchors --check-redirects
• Custom internal-route checker (BROKEN=0)
• Local preview and browser QA with no JavaScript errors
• HTTP smoke tests: 11/11 changed routes returned 200 with no "Page Not Found"