Find libmosquitto and ship it in release packages (iteration 2, step 1)

cmake/Mosquitto.cmake finds it through pkg-config; with
FRAMEASSISTANT_SHIP_MOSQUITTO=ON (all package presets) it installs
lib/libmosquitto.so.1 and Debian's copyright file and excludes the
library from the Qt bundler (D35). The build containers get
libmosquitto-dev, the test container the mosquitto broker.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

CMakeLists.txt

@@ -56,6 +56,8 @@ include(Dashboard)
 if(VRDASH_DEPLOY_QT)
     include(BundleQt)
 endif()
+# After BundleQt: adds libmosquitto to its exclusion list when shipping it.
+include(Mosquitto)
 
 add_subdirectory(src)
 add_subdirectory(resources)