Add documentation for KUKA Sunrise features and programs

- Created a new document for the Station interface, detailing its menu structure, process data, safety functions, frames, and smartPAD function buttons.
- Added a document for RobotPowerControl, explaining its purpose for safely shutting down or restarting the KUKA Sunrise Cabinet controller.
- Introduced ServerFriRos2 documentation, outlining its role in establishing an FRI connection between the KUKA LBR iiwa and a ROS 2 computer.
- Documented the TeachKuka application, which allows manual teaching of the KUKA LBR iiwa, including position capturing and trajectory recording.
- Added an overview of Sunrise Workbench, including installation instructions for Windows and Linux.
- Created a section on installing a Windows compatibility tool (PortProton) on Linux.
- Documented the installation process for SunriseWorkbench on Linux using PortProton.
- Added installation instructions for SunriseWorkbench on Windows.
- Created troubleshooting documentation for configuration errors and SSL errors during installation.
- Implemented a hook to generate the shared PDF only during the default-language build.

doc/lwc-doc/docs/getting-started/concepts/architecture.en.md

@@ -0,0 +1,15 @@
+# System architecture
+
+!!! info "Work in progress"
+    A detailed description of the system architecture is being prepared.
+
+LWC is built as a set of interconnected ROS 2 packages. Key components:
+
+- **iiwa_bringup** — launch files and the entry point for starting the system
+- **iiwa_controller** — hardware interface connecting to the KUKA controller over FRI
+- **iiwa_planning** — MoveIt 2-based motion planning
+- **iiwa_web** — REST API and MCP server for external control
+- **iiwa_description** — URDF robot description and Webots worlds
+- **iiwa_config** — configuration files for MoveIt, controllers, and cameras
+- **iiwa_utils** — helper Python utilities and configuration loading
+- **iiwa_msgs** — custom ROS 2 message types (action and srv)