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, 60 insertions, 0 deletions

diff --git a/src/BobinkAuth.h b/src/BobinkAuth.h
new file mode 100644
index 0000000..2e3ea6a
--- /dev/null
+++ b/src/BobinkAuth.h
@@ -0,0 +1,60 @@
+#ifndef BOBINKAUTH_H
+#define BOBINKAUTH_H
+
+#include <QObject>
+#include <QOpcUaAuthenticationInformation>
+#include <QQmlEngine>
+
+class BobinkAuth : public QObject {
+  Q_OBJECT
+  QML_ELEMENT
+
+  Q_PROPERTY(AuthMode mode READ mode WRITE setMode NOTIFY modeChanged)
+  Q_PROPERTY(
+      QString username READ username WRITE setUsername NOTIFY usernameChanged)
+  Q_PROPERTY(
+      QString password READ password WRITE setPassword NOTIFY passwordChanged)
+  Q_PROPERTY(
+      QString certPath READ certPath WRITE setCertPath NOTIFY certPathChanged)
+  Q_PROPERTY(
+      QString keyPath READ keyPath WRITE setKeyPath NOTIFY keyPathChanged)
+
+public:
+  enum AuthMode { Anonymous, UserPass, Certificate };
+  Q_ENUM(AuthMode)
+
+  explicit BobinkAuth(QObject *parent = nullptr);
+
+  AuthMode mode() const;
+  void setMode(AuthMode mode);
+
+  QString username() const;
+  void setUsername(const QString &username);
+
+  QString password() const;
+  void setPassword(const QString &password);
+
+  QString certPath() const;
+  void setCertPath(const QString &path);
+
+  QString keyPath() const;
+  void setKeyPath(const QString &path);
+
+  QOpcUaAuthenticationInformation toAuthenticationInformation() const;
+
+signals:
+  void modeChanged();
+  void usernameChanged();
+  void passwordChanged();
+  void certPathChanged();
+  void keyPathChanged();
+
+private:
+  AuthMode m_mode = Anonymous;
+  QString m_username;
+  QString m_password;
+  QString m_certPath;
+  QString m_keyPath;
+};
+
+#endif // BOBINKAUTH_H