Feat: Add KNCM_settings.cfg with nozzle cleaning macros

Created KNCM_settings.cfg with essential macros:
- CLEAN_NOZZLE: Wipe nozzle on brush/cloth
- SMART_PARK: Park nozzle at front for easy access
- LINE_PURGE: Print purge line at start
- Frame_Light_ON/OFF: Control frame LED (PD14)
- Part_Light_ON/OFF: Control part light (PD13)

Also added [output_pin] definitions for lights:
- frame_light: PD14
- part_light: PD13

This fixes: 'Unknown pin chip name rpi' error caused by
missing KNCM_settings.cfg include.

The file was previously included but didn't exist in the repo.

user_settings_clean.cfg

@@ -3,7 +3,7 @@
 # Optimized for Bambu Lab Hotend (23 mm³/s) & Original Hotend (15 mm³/s)
 # ============================================================================
 
-[include KNCM_settings.cfg]
+[include open4neptune-new/KNCM_settings.cfg]
 [include open4neptune-new/calibration/*.cfg]
 
 [skew_correction]
@@ -41,6 +41,20 @@ sensor_mcu: cartographer
 min_temp: 5
 max_temp: 105
 
+# ============================================================================
+# OUTPUT PINS - Neptune 4 Plus
+# ============================================================================
+
+[output_pin frame_light]
+pin: PD14
+pwm: False
+value: 0
+
+[output_pin part_light]
+pin: PD13
+pwm: False
+value: 0
+
 # ============================================================================
 # ADXL345 ACCELEROMETER
 # ============================================================================