docs: refresh Windows host page for new users; drop stale Status/NVIDIA-only/SudoVDA

Rewrite the Windows host docs page for first-time setup, on par with the
other host guides: remove the standout "Status:" banner, restructure into
Requirements / Install (web console + pairing + configure) / How it works /
Notes & limits.

Bring the content up to date with the shipping host:
- encode is all-vendor (NVENC/AMF/QSV + software fallback), not NVIDIA-only
- virtual display is punktfunk's own pf-vdisplay IDD (SudoVDA removed)
- gamepads need no prerequisite — UMDF drivers bundled; ViGEmBus is gone
- add HDR10 + Vulkan-game HDR layer coverage

Fix the same stale claims where other pages cross-reference the Windows host
(requirements, running-as-a-service, install, roadmap, status).

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

docs-site/content/docs/status.md

@@ -14,7 +14,7 @@ A high-level view of where punktfunk stands. The ordered plan of work is on the
 | **Core** — `punktfunk-core` + C ABI (protocol · FEC · crypto) | ✅ complete & hardened |
 | **GameStream host** (Moonlight-compatible) | ✅ working end-to-end; HDR/surround-audio polish open |
 | **Native protocol** — `punktfunk/1` (QUIC control + UDP data, GF(2¹⁶) Leopard FEC + AES-GCM) | ✅ full session planes, validated live |
-| **Windows host** (NVIDIA, x64) | 🟡 implemented & shipping as a signed installer; NVIDIA-only, newer than the Linux host |
+| **Windows host** (x64) | 🟡 implemented & shipping as a signed installer; NVIDIA/AMD/Intel encode, newer than the Linux host |
 | **macOS / iOS / iPadOS / tvOS client** | ✅ full client; on-glass stage-2 presenter behind an opt-in flag, becoming the default |
 | **Linux client** (`punktfunk-client`, GTK4/libadwaita) | ✅ full client; VAAPI zero-copy decode + software fallback |
 | **Windows client** (`punktfunk-client`, WinUI 3) | ✅ stage 1 complete; ships as signed MSIX; on-glass hardware validation pending |