feat(slave_node): Add HSI clock configuration and cleanup

Adds a commented-out clock configuration to the  file. This allows switching the clock source from the external high-speed oscillator (HSE) to the internal high-speed oscillator (HSI), which can be useful if an external crystal is not present.

Also, removes the debug log level for the settings subsystem from the project configuration.

software/apps/slave_node/boards/weact_stm32g431_core.overlay

@@ -13,6 +13,27 @@
     };
 };
 
+// Clock configuration: Uncomment the following section to use calibrated HSI instead of HSE
+//&clk_hse {
+//    status = "disabled";  // Disable external crystal oscillator
+//};
+//
+//&clk_hsi {
+//    status = "okay";      // Enable internal high-speed oscillator (16 MHz, calibrated)
+//};
+//
+//&pll {
+//    // Change PLL source from HSE to HSI
+//    clocks = <&clk_hsi>;
+//    // Adjust multipliers to maintain 144 MHz system clock with 16 MHz HSI input
+//    // HSI = 16 MHz, div-m = 4, mul-n = 72, div-r = 2
+//    // PLL_VCO = (16 MHz / 4) * 72 = 288 MHz  
+//    // SYSCLK = 288 MHz / 2 = 144 MHz
+//    div-m = <4>;    // Divide HSI by 4 (16 MHz / 4 = 4 MHz)
+//    mul-n = <72>;   // Multiply by 72 (4 MHz * 72 = 288 MHz)
+//    div-r = <2>;    // Divide by 2 for system clock (288 MHz / 2 = 144 MHz)
+//};
+
 &usart1 {
 	modbus0 {
 		compatible = "zephyr,modbus-serial";

software/apps/slave_node/prj.conf

@@ -13,7 +13,6 @@ CONFIG_NVS=y
 CONFIG_FLASH=y
 CONFIG_FLASH_MAP=y
 CONFIG_FLASH_PAGE_LAYOUT=y
-CONFIG_SETTINGS_LOG_LEVEL_DBG=y
 
 # Config modbus
 CONFIG_UART_INTERRUPT_DRIVEN=y