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>

CMakePresets.json

@@ -30,6 +30,7 @@
       "cacheVariables": {
         "CMAKE_BUILD_TYPE": "RelWithDebInfo",
         "VRDASH_DEPLOY_QT": "ON",
+        "FRAMEASSISTANT_SHIP_MOSQUITTO": "ON",
         "VRDASH_BUILD_TESTS": "OFF"
       }
     },
@@ -41,6 +42,7 @@
       "cacheVariables": {
         "CMAKE_BUILD_TYPE": "RelWithDebInfo",
         "VRDASH_DEPLOY_QT": "ON",
+        "FRAMEASSISTANT_SHIP_MOSQUITTO": "ON",
         "VRDASH_BUILD_TESTS": "OFF"
       }
     },
@@ -52,6 +54,7 @@
         "CMAKE_BUILD_TYPE": "RelWithDebInfo",
         "VRDASH_DEPLOY_QT": "OFF",
         "VRDASH_QML_BYTECODE_ONLY": "ON",
+        "FRAMEASSISTANT_SHIP_MOSQUITTO": "ON",
         "VRDASH_BUILD_TESTS": "OFF"
       }
     },
@@ -64,6 +67,7 @@
         "CMAKE_BUILD_TYPE": "RelWithDebInfo",
         "VRDASH_DEPLOY_QT": "OFF",
         "VRDASH_QML_BYTECODE_ONLY": "ON",
+        "FRAMEASSISTANT_SHIP_MOSQUITTO": "ON",
         "VRDASH_BUILD_TESTS": "OFF"
       }
     }