Initial Bobink library: BobinkAuth, BobinkClient, and demo app

Implements the core OPC UA wrapper library with:
- Build system with automatic dep building (open62541, QtOpcUa)
- BobinkAuth: QML auth component (anonymous/userpass/certificate)
- BobinkClient: QML singleton managing connection, LDS discovery,
  PKI configuration, endpoint selection, and certificate trust flow
- Demo app for manual testing of the full connection flow

1 files changed, 105 insertions, 0 deletions

diff --git a/cmake/BuildDeps.cmake b/cmake/BuildDeps.cmake
new file mode 100644
index 0000000..8a1fa89
--- /dev/null
+++ b/cmake/BuildDeps.cmake
@@ -0,0 +1,105 @@
+set(OPEN62541_SOURCE_DIR "${CMAKE_SOURCE_DIR}/deps/open62541")
+set(OPEN62541_BUILD_DIR "${CMAKE_BINARY_DIR}/deps/open62541-build")
+set(OPEN62541_INSTALL_DIR "${CMAKE_BINARY_DIR}/deps/open62541-install")
+set(QTOPCUA_SOURCE_DIR "${CMAKE_SOURCE_DIR}/deps/qtopcua")
+set(QTOPCUA_BUILD_DIR "${CMAKE_BINARY_DIR}/deps/qtopcua-build")
+
+# Verify submodules are initialized
+if(NOT EXISTS "${OPEN62541_SOURCE_DIR}/CMakeLists.txt")
+  message(
+    FATAL_ERROR
+      "open62541 submodule not initialized. Run: git submodule update --init --recursive"
+  )
+endif()
+if(NOT EXISTS "${QTOPCUA_SOURCE_DIR}/CMakeLists.txt")
+  message(
+    FATAL_ERROR
+      "qtopcua submodule not initialized. Run: git submodule update --init --recursive"
+  )
+endif()
+
+# --- open62541 ---
+if(NOT EXISTS "${OPEN62541_INSTALL_DIR}/lib/libopen62541.so")
+
+  message(STATUS "Configuring open62541 in ${OPEN62541_BUILD_DIR}...")
+  set(_cmd
+      ${CMAKE_COMMAND}
+      -S
+      "${OPEN62541_SOURCE_DIR}"
+      -B
+      "${OPEN62541_BUILD_DIR}"
+      -G
+      Ninja
+      -DCMAKE_INSTALL_PREFIX=${OPEN62541_INSTALL_DIR}
+      -DBUILD_SHARED_LIBS=ON
+      -DUA_ENABLE_ENCRYPTION=OPENSSL
+      -DUA_ENABLE_DISCOVERY=ON)
+  execute_process(COMMAND ${_cmd} RESULT_VARIABLE _result)
+  if(_result)
+    list(JOIN _cmd " " _cmd_str)
+    message(FATAL_ERROR "${_cmd_str} failed: ${_result}")
+  endif()
+
+  message(STATUS "Building open62541 in ${OPEN62541_BUILD_DIR}...")
+  set(_cmd ${CMAKE_COMMAND} --build "${OPEN62541_BUILD_DIR}" --parallel)
+  execute_process(COMMAND ${_cmd} RESULT_VARIABLE _result)
+  if(_result)
+    list(JOIN _cmd " " _cmd_str)
+    message(FATAL_ERROR "${_cmd_str} failed: ${_result}")
+  endif()
+
+  message(STATUS "Installing open62541 to ${OPEN62541_INSTALL_DIR}...")
+  set(_cmd ${CMAKE_COMMAND} --install "${OPEN62541_BUILD_DIR}")
+  execute_process(COMMAND ${_cmd} RESULT_VARIABLE _result)
+  if(_result)
+    list(JOIN _cmd " " _cmd_str)
+    message(FATAL_ERROR "${_cmd_str} failed: ${_result}")
+  endif()
+
+else()
+  message(STATUS "open62541 already built, skipping")
+endif()
+
+# --- qtopcua ---
+
+message(STATUS "CMAKE_PREFIX_PATH=${CMAKE_PREFIX_PATH}")
+find_program(QT_CMAKE_COMMAND bin/qt-cmake REQUIRED)
+
+if(NOT EXISTS "${QTOPCUA_BUILD_DIR}/lib/libQt6OpcUa.so")
+
+  message(STATUS "Configuring qtopcua in ${QTOPCUA_BUILD_DIR}...")
+  set(_cmd
+      ${QT_CMAKE_COMMAND}
+      -S
+      "${QTOPCUA_SOURCE_DIR}"
+      -B
+      "${QTOPCUA_BUILD_DIR}"
+      -G
+      Ninja
+      -DINPUT_open62541=system
+      -DCMAKE_PREFIX_PATH=${OPEN62541_INSTALL_DIR})
+  execute_process(COMMAND ${_cmd} RESULT_VARIABLE _result)
+  if(_result)
+    list(JOIN _cmd " " _cmd_str)
+    message(FATAL_ERROR "${_cmd_str} failed: ${_result}")
+  endif()
+
+  message(STATUS "Building qtopcua in ${QTOPCUA_BUILD_DIR}...")
+  set(_cmd ${CMAKE_COMMAND} --build "${QTOPCUA_BUILD_DIR}" --parallel)
+  execute_process(COMMAND ${_cmd} RESULT_VARIABLE _result)
+  if(_result)
+    list(JOIN _cmd " " _cmd_str)
+    message(FATAL_ERROR "${_cmd_str} failed: ${_result}")
+  endif()
+
+  message(STATUS "Installing qtopcua to ${QTOPCUA_BUILD_DIR}...")
+  set(_cmd ${CMAKE_COMMAND} --install "${QTOPCUA_BUILD_DIR}")
+  execute_process(COMMAND ${_cmd} RESULT_VARIABLE _result)
+  if(_result)
+    list(JOIN _cmd " " _cmd_str)
+    message(FATAL_ERROR "${_cmd_str} failed: ${_result}")
+  endif()
+
+else()
+  message(STATUS "qtopcua already built, skipping")
+endif()