feat: restore bench section UI with controls, PID RPM ramp, flowmeter charts, and fix CAN IDs

Restore the full bench control panel from the old source with MVVM architecture:

- Two-column left panel layout: bench info displays (RPM with target/voltage,
  temps, pressures, Q-flow, pump live values) and user commands (direction
  toggle, start/stop with RPM popup and quick-select buttons, oil pump toggle,
  turn downcounter with CAN send)
- PID RPM ramp controller (BenchPidController) with bumpless startup,
  anti-windup, and derivative-on-measurement for smooth motor speed transitions
- Real-time flowmeter charts (LiveChartsCore) for Q-Delivery and Q-Over
  with tolerance band overlays
- Bench/pump CAN liveness detection in PcanAdapter (receive-only IDs)
- K-Line connection status indicator (placeholder)
- Periodic relay bitmask sender (~21ms) and ElectronicMsg keepalive start
  on CAN connect, pump sender starts immediately on pump load

Fix critical CAN message ID bug: default bench XML values were incorrectly
converted from old source (decimal-notation hex parsed as actual hex digits,
e.g. "10" -> "A" instead of keeping "10" which parses as 0x10). Corrected
all IDs to match hardware: 0x10, 0x11, 0x13, 0x14, 0x15, 0x50, 0x51, 0x55.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Views/UserControls/FlowmeterChartView.xaml.cs

@@ -0,0 +1,16 @@
+using System.Windows.Controls;
+
+namespace HC_APTBS.Views.UserControls
+{
+    /// <summary>
+    /// UserControl hosting a single real-time flowmeter chart.
+    /// DataContext is expected to be a <see cref="HC_APTBS.ViewModels.SingleFlowChartViewModel"/>.
+    /// </summary>
+    public partial class FlowmeterChartView : UserControl
+    {
+        public FlowmeterChartView()
+        {
+            InitializeComponent();
+        }
+    }
+}