Upgrade Janus Debian package and manage systemd service (#1918)

Resolves #1917
Dependent on tiny-pilot/janus-debian#23

This PR makes use of an updated Janus Debian package, one that doesn't
create a systemd service. Instead, TinyPilot now fully manages the Janus
systemd service (similar to how our uStreamer Debian package works).

You can test this code on device by running:
```
curl \
  --silent \
  --show-error \
  --location \
  https://raw.githubusercontent.com/tiny-pilot/tinypilot/master/dev-scripts/device/install-bundle | \
  sudo bash -s -- \
    https://output.circle-artifacts.com/output/job/fa98e807-f880-4da5-bb31-0493bb2ea525/artifacts/0/bundler/dist/tinypilot-community-20250929T1303Z-1.11.0-18+677b746.tgz
```

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Author: jdeanwallace

bundler/create-bundle

@@ -71,7 +71,7 @@ readonly BUNDLE_FILENAME="tinypilot-${TINYPILOT_VARIANT}-${TIMESTAMP}-${TINYPILO
 # Download Janus Debian package.
 wget \
   --directory-prefix="${BUNDLE_DIR}" \
-  https://github.com/tiny-pilot/janus-debian/releases/download/1.3.2-20250808114245/janus_1.3.2-20250808114245_armhf.deb
+  https://github.com/tiny-pilot/janus-debian/releases/download/1.3.2-20250929125525/janus_1.3.2-20250929125525_armhf.deb
 
 # Download uStreamer Debian package.
 wget \

debian-pkg/debian/rules

@@ -19,6 +19,7 @@ override_dh_installsystemd:
 	dh_installsystemd --name=tinypilot-updater --no-start --no-enable
 	dh_installsystemd --name=usb-gadget --no-start
 	dh_installsystemd --name=ustreamer
+	dh_installsystemd --name=janus
 
 override_dh_virtualenv:
 	# Skip install because TinyPilot doesn't need to run setup.py to install.

…an-pkg/usr/share/tinypilot/janus.service debian-pkg/debian/tinypilot.janus.servicedebian-pkg/usr/share/tinypilot/janus.service renamed to debian-pkg/debian/tinypilot.janus.service debian-pkg/usr/share/tinypilot/janus.service renamed to debian-pkg/debian/tinypilot.janus.service

@@ -192,12 +192,4 @@ cp \
   /usr/share/tinypilot/janus.transport.websockets.jcfg \
   /etc/janus/janus.transport.websockets.jcfg
 
-# Override Janus systemd config.
-cp \
-  /usr/share/tinypilot/janus.service \
-  /etc/systemd/system/janus.service
-
-# Restart Janus to pick up the new config files.
-deb-systemd-invoke restart janus
-
 #DEBHELPER#