debian/daedalus-v4l2-dkms: new package — kernel module via DKMS

Mirror of arch/daedalus-v4l2-dkms into the Debian tree.
Architecture: all (source package — DKMS rebuilds per-kernel
at install time).  Same pin (f04d700, Phase 8.13 close).

Installs kernel/ source to /usr/src/daedalus_v4l2-<ver>/ with
generated dkms.conf.  postinst runs `dkms add` + `dkms
autoinstall` so the module builds against the running kernel's
headers automatically.  prerm runs `dkms remove --all`.

Same Makefile-include-path flattening as the Arch sibling:
copies daedalus_v4l2_proto.h into kernel/include/ and patches
the Makefile's -I path.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

debian/daedalus-v4l2-dkms/debian/control

@@ -0,0 +1,24 @@
+Source: daedalus-v4l2-dkms
+Section: kernel
+Priority: optional
+Maintainer: Markus Fritsche <mfritsche@reauktion.de>
+Build-Depends: debhelper-compat (= 13)
+Standards-Version: 4.6.2
+Homepage: https://git.reauktion.de/reauktion/daedalus-v4l2
+
+Package: daedalus-v4l2-dkms
+Architecture: all
+Depends: ${misc:Depends}, dkms (>= 2.1.0.0)
+Recommends: daedalus-v4l2,
+            linux-headers-generic | linux-headers
+Description: V4L2 stateless decoder shim kernel module (DKMS) — Pi 5 / CM5
+ Out-of-tree V4L2 m2m kernel module for the daedalus-v4l2 stack on
+ Raspberry Pi 5 / CM5. Registers /dev/videoNN (V4L2 stateless m2m
+ decoder), /dev/mediaNN (media controller with request API), and
+ /dev/daedalus-v4l2 (chardev bridge to the userspace daemon).
+ .
+ The actual decode happens in the userspace daemon shipped by the
+ daedalus-v4l2 package — this module is just the kernel-side V4L2
+ plumbing. Install both to actually serve VAAPI / V4L2 clients.
+ .
+ Built via DKMS against the running kernel's headers.