Refactor and document: fix cert filenames, add Doxygen, improve demo

Refactoring (issues 1,3,4,5,7,8,9,10 from review):
- Replace hardcoded cert filenames with certFile/keyFile properties
- Add 30s timeout to certificate trust QEventLoop
- Cache servers() QVariantList instead of rebuilding per call
- Validate URLs before passing to QtOpcUa
- Use ComboBox valueRole for robust enum mapping
- Add certificate trust dialog to demo
- Remove unnecessary RowLayout wrapper
- Remove debug output from BuildDeps.cmake

Documentation:
- Add Doxygen file blocks to all C++ files
- Document AuthMode enum, toAuthenticationInformation(), key
  Q_INVOKABLE methods, certificateTrustRequested signal contract
- Convert section banners to standard format
- Add file/target comments to CMake and QML files

1 files changed, 40 insertions, 25 deletions

diff --git a/src/BobinkAuth.h b/src/BobinkAuth.h
index 2e3ea6a..2bd3c05 100644
--- a/src/BobinkAuth.h
+++ b/src/BobinkAuth.h
@@ -1,3 +1,7 @@
+/**
+ * @file   BobinkAuth.h
+ * @brief  QML component for OPC UA authentication configuration.
+ */
 #ifndef BOBINKAUTH_H
 #define BOBINKAUTH_H
 
@@ -5,49 +9,60 @@
 #include <QOpcUaAuthenticationInformation>
 #include <QQmlEngine>
 
-class BobinkAuth : public QObject {
+class BobinkAuth : public QObject
+{
   Q_OBJECT
   QML_ELEMENT
 
-  Q_PROPERTY(AuthMode mode READ mode WRITE setMode NOTIFY modeChanged)
-  Q_PROPERTY(
+  Q_PROPERTY (AuthMode mode READ mode WRITE setMode NOTIFY modeChanged)
+  Q_PROPERTY (
       QString username READ username WRITE setUsername NOTIFY usernameChanged)
-  Q_PROPERTY(
+  Q_PROPERTY (
       QString password READ password WRITE setPassword NOTIFY passwordChanged)
-  Q_PROPERTY(
+  Q_PROPERTY (
       QString certPath READ certPath WRITE setCertPath NOTIFY certPathChanged)
-  Q_PROPERTY(
+  Q_PROPERTY (
       QString keyPath READ keyPath WRITE setKeyPath NOTIFY keyPathChanged)
 
 public:
-  enum AuthMode { Anonymous, UserPass, Certificate };
-  Q_ENUM(AuthMode)
+  /// Authentication modes supported by OPC UA.
+  enum AuthMode
+  {
+    Anonymous,
+    UserPass,
+    Certificate
+  };
+  Q_ENUM (AuthMode)
 
-  explicit BobinkAuth(QObject *parent = nullptr);
+  explicit BobinkAuth (QObject *parent = nullptr);
 
-  AuthMode mode() const;
-  void setMode(AuthMode mode);
+  AuthMode mode () const;
+  void setMode (AuthMode mode);
 
-  QString username() const;
-  void setUsername(const QString &username);
+  QString username () const;
+  void setUsername (const QString &username);
 
-  QString password() const;
-  void setPassword(const QString &password);
+  QString password () const;
+  void setPassword (const QString &password);
 
-  QString certPath() const;
-  void setCertPath(const QString &path);
+  QString certPath () const;
+  void setCertPath (const QString &path);
 
-  QString keyPath() const;
-  void setKeyPath(const QString &path);
+  QString keyPath () const;
+  void setKeyPath (const QString &path);
 
-  QOpcUaAuthenticationInformation toAuthenticationInformation() const;
+  /**
+   * @brief  Build a QOpcUaAuthenticationInformation from the
+   *         current mode and credentials.
+   */
+  QOpcUaAuthenticationInformation toAuthenticationInformation () const;
 
 signals:
-  void modeChanged();
-  void usernameChanged();
-  void passwordChanged();
-  void certPathChanged();
-  void keyPathChanged();
+  void modeChanged ();
+  void usernameChanged ();
+  void passwordChanged ();
+  void certPathChanged ();
+  void keyPathChanged ();
 
 private:
   AuthMode m_mode = Anonymous;