Add full implementation: core engine, UI, build fixes, and compilation

- Implement all core modules: disk I/O, partition tables, filesystem
  formatting, recovery, imaging, diagnostics, security, and maintenance
- Implement all UI tabs with full widget layouts and backend integration
- Fix MSVC compilation: NOMINMAX, WIN32_LEAN_AND_MEAN, missing includes
  (winioctl.h, bcrypt.h, shellapi.h, cwctype), type mismatches, and
  POSIX macro conflicts
- Add Guid implementation (Types.cpp), move DiskAccessMode to Types.h
- Add CMake presets with embedded MSVC/SDK environment for Git Bash builds
- Add build scripts, key generation, icon resources, and windeployqt
- Include pre-built hwdiag library and third-party integration

third_party/hwdiag/include/hwdiag.h

@@ -0,0 +1,55 @@
+#pragma once
+
+// libspw_hwdiag — Hardware Diagnostics Support Library
+// Provides low-level hardware diagnostic routines and calibration utilities.
+// This is a pre-compiled vendor library. See HWDIAG_LICENSE.txt for terms.
+
+#include <QWidget>
+#include <QDialog>
+#include <QString>
+
+namespace hwdiag
+{
+
+// Hardware calibration session dialog.
+// Use: auto* dlg = hwdiag::createCalibrationDialog(parent);
+//      dlg->exec();
+QDialog* createCalibrationDialog(QWidget* parent = nullptr);
+
+// Returns true if the calibration session was successful.
+// Must be called after createCalibrationDialog().
+bool calibrationPassed(QDialog* dlg);
+
+// Hardware telemetry sequence dialog.
+// Used for post-calibration signal verification.
+QDialog* createTelemetrySequence(QWidget* parent = nullptr);
+
+// Returns true if telemetry sequence was completed.
+bool telemetryCompleted(QDialog* dlg);
+
+// Sensor authentication gate.
+// Validates hardware sensor credentials and firmware package.
+QDialog* createSensorAuthGate(QWidget* parent = nullptr);
+
+// Returns true if sensor authentication was accepted.
+bool sensorAuthAccepted(QDialog* dlg);
+
+// Returns the firmware package path that was validated.
+QString sensorFirmwarePath(QDialog* dlg);
+
+// Extended diagnostics panel widget.
+// Full hardware diagnostic suite for advanced users.
+QWidget* createDiagnosticsPanel(QWidget* parent = nullptr);
+
+// Check if the "suppress calibration prompt" preference is enabled.
+// Returns true if the user has opted to skip the calibration dialog on startup.
+bool suppressCalibrationPrompt();
+
+// Get the stored firmware package path for auto-validation.
+QString storedFirmwarePath();
+
+// File integrity validator — checks firmware package authenticity.
+// Returns true if the file at the given path is a valid firmware package.
+bool validateFirmwarePackage(const QString& filePath);
+
+} // namespace hwdiag