feat: forward UART parsed boot info to main log window

UartMonitorWindow now accepts on_log callback. When boot info
(IP, version) is parsed from serial output, it:
- Appears in the UART window's own log (prefix [UART])
- Forwards to main window's log panel via on_log callback
- Unified [UART] prefix across both windows (was [BOOT] in
  UART window, [UART] Boot detected: in main log)

src/gui/main_window.py

@@ -1164,7 +1164,7 @@ class MainWindow(ctk.CTk):
         self._uart_monitor = UartMonitor(port, self._config.serial_baudrate)
         self._uart_monitor.on_line = lambda line: self._log_message(f"  [UART] {line}")
         self._uart_monitor.on_boot_info = lambda info: (
-            self._log_message(f"  [UART] Boot detected: IP={info.ip_address}, Ver={info.version}")
+            self._log_message(f"  [UART] IP={info.ip_address}, Ver={info.version}")
             if info.ip_address or info.version else None
         )
         self._uart_monitor.on_error = lambda e: self._log_message(f"  [UART] Error: {e}")
@@ -1216,7 +1216,10 @@ class MainWindow(ctk.CTk):
         """Open the UART Monitor window."""
         port = self._port_var.get()
         baudrate = self._config.serial_baudrate if self._config else 115200
-        self._uart_window = UartMonitorWindow(self, port=port, baudrate=baudrate)
+        self._uart_window = UartMonitorWindow(
+            self, port=port, baudrate=baudrate,
+            on_log=self._log_message,
+        )
 
     def _test_serial_version(self) -> None:
         """Test serial port by sending 'ver()' command and parsing response."""