docs: link every client in the clients-page chooser + correctness sweep

The "Which should I use?" table on the clients page listed most client
names as bold text, not links — only the Decky plugin and pf-webos were
clickable — so the client references appeared broken. Link each client to
its section (or dedicated page), and fix a stale Windows headless command.

Repo-wide docs correctness/staleness pass against the code:
- steam-deck: client-not-found -> flatpak-not-found (the real backend code)
- install: host cert is punktfunk-host-windows_<ver>.cer, not ..._setup.cer
- configuration: GPU_PRIORITY_CLASS default is auto; 10BIT/444 are default-on
- how-it-works/index: GameStream/Moonlight is opt-in (--gamestream)
- roadmap: clipboard sync is shipped, not planned
- install-client: MSIX/cert artifacts are arch-suffixed (_x64/_arm64)
- requirements: fix garbled 22H2/IddCx sentence
- status: Linux encode also covers AMD/Intel (VAAPI/Vulkan Video)
- automation: add the plugins.changed event
- windows-host: note the optional bundled VB-CABLE virtual mic
- sway: PUNKTFUNK_COMPOSITOR=hyprland is a wlroots-family alias
- running-as-a-service: punktfunk-probe is a source-build-only dev tool

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

docs-site/content/docs/windows-host.md

@@ -49,6 +49,8 @@ Download the signed `punktfunk-host-setup-<ver>.exe` from the
   displays,
 - installs the bundled **virtual gamepad drivers** (DualSense, DualShock 4, Xbox 360),
 - registers the bundled **HDR Vulkan layer** so Vulkan games can enable HDR over the virtual display,
+- optionally installs **VB-CABLE** (VB-Audio, donationware) as the virtual microphone for client
+  mic passthrough — a checkbox in the installer,
 - sets up the **web management console** (see below).
 
 For an unattended install, append `/VERYSILENT`. Upgrades and uninstall go through **Add/Remove
@@ -122,7 +124,7 @@ pipeline orchestration are all shared with the Linux host. The Windows host is a
 | **Input — mouse/keyboard** | libei / wlr protocols | **SendInput** (Win32 VK + absolute mouse) |
 | **Input — gamepads** | uinput Xbox 360 + UHID DualSense/DS4 | **UMDF** virtual pads — DualSense, DualShock 4, Xbox 360 (XUSB) + rumble |
 | **Audio capture** | PipeWire sink-monitor | **WASAPI loopback** |
-| **Virtual mic** | PipeWire `Audio/Source` | WASAPI virtual mic |
+| **Virtual mic** | PipeWire `Audio/Source` | **VB-CABLE** virtual device (optional), captured via WASAPI |
 
 The virtual display is **pf-vdisplay**, Punktfunk's own all-Rust **Indirect Display Driver (IDD)**. The
 host creates a shared GPU texture ring and the driver pushes finished frames straight into it — a real