rename campaign packages to use -fourier suffix

Stock-replacing pkgnames (kwin, qt6-base) hid the campaign carry from
'yay -Sl | grep fouri'. Renamed to -fourier suffix everywhere, with
conflicts/provides/replaces so existing stock installs auto-migrate
on next pacman -Syu. Pkgrel bumped on each.

  kwin                       -> kwin-fourier
  qt6-base                   -> qt6-base-fourier
  qt6-xcb-private-headers    -> qt6-xcb-private-headers-fourier
  ffmpeg-v4l2-request-git    -> ffmpeg-v4l2-request-fourier
  vulkan-panfrost            -> vulkan-panfrost-fourier

arch/ffmpeg-v4l2-request-git/PKGBUILD

@@ -19,12 +19,12 @@
 # Speex dropped — not needed on the Fourier fleet. (No SDL2 means no
 # `ffplay` binary; mpv covers interactive playback.)
 
-pkgname=ffmpeg-v4l2-request-git
+pkgname=ffmpeg-v4l2-request-fourier
 _srcname=FFmpeg
 _version='8.1'
 _commit='b57fbbe50c9b2656fad86a1a7eeabfd2b2a50935'  # v4l2-request-n8.1 tip 2026-04-24
 pkgver=8.1.r123329.b57fbbe
-pkgrel=2
+pkgrel=3
 epoch=2
 pkgdesc='FFmpeg with V4L2 Request API hwaccel (Rockchip / Allwinner stateless decode)'
 arch=('aarch64')
@@ -76,6 +76,7 @@ provides=(
   ffmpeg
 )
 conflicts=(ffmpeg)
+replaces=(ffmpeg ffmpeg-v4l2-request-git)
 source=("git+https://github.com/Kwiboo/FFmpeg.git#commit=${_commit}"
         '0001-libudev-bypass-fallback.patch')
 sha256sums=('SKIP' 'SKIP')