docs: update README + docs site for public readiness

Refresh the README and documentation for public visitors:

- README: public-facing rewrite with accurate status for all four native
  clients (macOS, Linux, Windows, Android) and the Windows host.
- docs site: fix stale client status (Android is a full client, not a
  scaffold; Windows client is stage-1 complete + signed MSIX), add the
  missing Android client section, correct "which client" guidance.
- Windows host: corrected from "deferred/scoped" to implemented & shipping
  (NVIDIA-only, x64-only) across windows-host, roadmap, status,
  requirements, running-as-a-service, and the README.
- Remove internal infrastructure from public docs (box names, private IPs,
  SSH/token commands, deploy topology); rewrite status.md as a public
  project-status page; sanitize ci.md and implementation-plan.md.
- Update clients/android and clients/apple READMEs to current state.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

docs-site/content/docs/pairing.md

@@ -50,7 +50,8 @@ command line instead; the production `serve --native` host arms pairing from the
 
 Then, on the client:
 
-- **Apple app:** select the host (or use *Pair with PIN…* from its menu) and enter the PIN.
+- **Native clients (Apple, Linux, Windows, Android):** select the host (or use *Pair with PIN…* from
+  its menu) and enter the PIN the host displays.
 - **Moonlight:** choose **Pair**; Moonlight shows the PIN to confirm on the host side.
 
 ## Requiring pairing (the default)