chromium-fourier: bump to 148.0.7778.178, add Debian recipe

Arch: version 147→148, drop enable_nacl (removed upstream), fix
nv12-external-oes patch context for 148 (base/numerics/safe_conversions.h
include removed upstream). Header comment updated: native build fiction →
cross-compile reality.

Debian: new build-deb.sh that assembles .deb from pre-built artifacts
on CT 220 (data). Same binary artifacts as the Arch package, launcher at
/usr/bin/chromium-fourier (no Conflicts with stock chromium on Debian).

Both packages published to packages.reauktion.de:
- Arch: marfrit/aarch64/chromium-fourier 1:148.0.7778.178-1
- Debian: trixie+bookworm/main/arm64 chromium-fourier 1:148.0.7778.178-1

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

debian/chromium-fourier/debian/changelog

@@ -0,0 +1,8 @@
+chromium-fourier (1:148.0.7778.178-1) trixie; urgency=medium
+
+  * Chromium 148.0.7778.178 with V4L2 HW decode patches for Rockchip.
+  * Cross-compiled from x86_64 using chromium's bundled clang.
+  * Three fourier patches: enable-v4l2-decoder-default,
+    wayland-allow-direct-egl-gles2, nv12-external-oes-on-modifier-external-only.
+
+ -- Markus Fritsche <mfritsche@reauktion.de>  Sat, 24 May 2026 09:00:00 +0200

debian/chromium-fourier/debian/copyright

@@ -0,0 +1,32 @@
+Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
+Upstream-Name: Chromium
+Upstream-Contact: chromium-dev@chromium.org
+Source: https://www.chromium.org/
+
+Files: *
+Copyright: The Chromium Authors
+License: BSD-3-Clause
+
+Files: debian/*
+Copyright: 2026 Markus Fritsche <mfritsche@reauktion.de>
+License: BSD-3-Clause
+
+License: BSD-3-Clause
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions are met:
+ .
+ 1. Redistributions of source code must retain the above copyright notice,
+    this list of conditions and the following disclaimer.
+ .
+ 2. Redistributions in binary form must reproduce the above copyright
+    notice, this list of conditions and the following disclaimer in the
+    documentation and/or other materials provided with the distribution.
+ .
+ 3. Neither the name of the copyright holder nor the names of its
+    contributors may be used to endorse or promote products derived from
+    this software without specific prior written permission.
+ .
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ ARE DISCLAIMED.