feat(gui): add unified origin commands for PLM operations (#14)

- Create CommandOrigin.cpp with Origin_Commit, Origin_Pull, Origin_Push,
  Origin_Info, Origin_BOM commands
- Commands delegate to current origin's extended operations
- Commands auto-disable based on origin capabilities (supportsRevisions,
  supportsBOM, supportsPartNumbers)
- Add 'Origin Tools' toolbar with PLM operations
- Add origin commands to File menu
- Register commands via CreateOriginCommands() in Application startup

This implements Issue #14: Dynamic toolbar extension for Silo commands

src/Gui/Workbench.cpp

@@ -682,7 +682,10 @@ MenuItem* StdWorkbench::setupMenuBar() const
     file->setCommand("&File");
     *file << "Std_New" << "Std_Open" << "Std_RecentFiles" << "Separator" << "Std_CloseActiveWindow"
           << "Std_CloseAllWindows" << "Separator" << "Std_Save" << "Std_SaveAs"
-          << "Std_SaveCopy" << "Std_SaveAll" << "Std_Revert" << "Separator" << "Std_Import"
+          << "Std_SaveCopy" << "Std_SaveAll" << "Std_Revert"
+          << "Separator" << "Origin_Commit" << "Origin_Pull" << "Origin_Push"
+          << "Origin_Info" << "Origin_BOM"
+          << "Separator" << "Std_Import"
           << "Std_Export" << "Std_MergeProjects" << "Std_ProjectInfo"
           << "Separator" << "Std_Print" << "Std_PrintPreview" << "Std_PrintPdf"
           << "Separator" << "Std_Quit";
@@ -836,6 +839,12 @@ ToolBarItem* StdWorkbench::setupToolBars() const
     file->setCommand("File");
     *file << "Std_Origin" << "Std_New" << "Std_Open" << "Std_Save";
 
+    // Origin Tools (PLM operations - commands auto-disable when not applicable)
+    auto originTools = new ToolBarItem(root);
+    originTools->setCommand("Origin Tools");
+    *originTools << "Origin_Commit" << "Origin_Pull" << "Origin_Push"
+                 << "Separator" << "Origin_Info" << "Origin_BOM";
+
     // Edit
     auto edit = new ToolBarItem(root);
     edit->setCommand("Edit");