feat(host/windows,packaging): installer overhaul - branding, VB-CABLE, GameStream choice, driver uninstall

- Modern branded wizard: WizardStyle=modern dynamic windows11 (Inno >= 6.6,
  plain-modern fallback for older compilers; CI provisioning upgrades a
  pre-6.6 Inno). Brand-mark wizard side panels + header tiles (100-200% DPI)
  and a multi-size punktfunk.ico (SetupIconFile + Apps & Features), generated
  AND committed by branding/gen-branding.ps1 from the canonical brand geometry.
  Gotcha encoded in the script: ISCC rejects all-PNG icons, so entries <= 64px
  are classic DIBs (PNG only at 128/256), and the ICO is load-verified.

- VB-CABLE actually ships now: windows-host.yml never set VBCABLE_DIR, so every
  published installer silently omitted the virtual mic (broken mic passthrough
  in the field). CI provisions the pinned, SHA-256-verified official Pack45
  (provision-windows-punktfunk-extras.ps1) and the pack now FAILS on a
  supplied-but-invalid dir instead of shipping mic-less again. Attribution per
  VB-Audio's bundling grant surfaced in the visible wizard task text (vendor,
  vb-cable.com, donationware) on top of the licenses notice.

- GameStream (Moonlight) compat is a wizard task (checked by default) ->
  service install --gamestream=on|off writes PUNKTFUNK_HOST_CMD=
  serve[ --gamestream] into host.env. Only the two canonical values are ever
  rewritten - a hand-customized command line survives upgrades. Silent
  installs: /MERGETASKS="!gamestream".

- Driver uninstall (field report: our virtual-device drivers survived
  uninstall): new `driver uninstall [--gamepad]` removes the pf-vdisplay
  device node(s) + the pf-vdisplay/pf-dualsense/pf-xusb driver-store packages,
  wired into [UninstallRun] after service uninstall. Locale-safe by
  construction: devices matched on unlocalized VALUES (never pnputil's
  localized labels), packages found by INF content scan - validated against a
  German-locale box ("Instanz-ID:" parse; 7/7 punktfunk INFs matched, no
  foreign hits). VB-CABLE is deliberately left installed (shared third-party
  component with its own uninstaller).

Installer compile, cargo check/clippy/fmt, and the ASCII locale gate are green;
the wizard look + uninstall flow still need one on-glass pass on a disposable
box (this box runs the live host).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

scripts/windows/host.env.example

@@ -35,7 +35,9 @@ RUST_LOG=info
 
 # The host subcommand the service launches. Default: `serve --gamestream` (native punktfunk/1 host
 # ALWAYS on + the GameStream/Moonlight-compat planes). Use `serve` for a SECURE native-only host
-# (no plain-HTTP pairing / legacy GCM nonce reuse — security-review #5/#9). Uncomment to override.
+# (no plain-HTTP pairing / legacy GCM nonce reuse — security-review #5/#9). The installer's
+# "Enable GameStream (Moonlight) compatibility" task sets this; a custom value you write here is
+# never overwritten by a reinstall/upgrade.
 #PUNKTFUNK_HOST_CMD=serve --gamestream
 
 # Multi-GPU boxes only: force the NVENC/Desktop-Duplication GPU by Description substring. Leave