Feat: Update Orca Slicer filament profiles with calibrated PA values

Updated pressure_advance values for all filament profiles based on
real calibration tests with Neptune 4 Plus + Bambu Lab Hotend.

Bambu Lab Hotend (23 mm³/s, steel nozzle):
- PLA: 0.045 (calibrated via PA_TEST_PATTERN)
- PETG: 0.070
- ABS: 0.060
- TPU: 0.100
- Carbon-Fiber: 0.040

Original Hotend (15 mm³/s, brass nozzle):
- PLA: 0.050 (slightly higher due to bowden-style path)
- PETG: 0.075
- ABS: 0.065
- TPU: 0.110

These values are now embedded in the Orca profiles and will be
automatically sent to Klipper at print start. Klipper config retains
fallback values.

orca-profiles/Neptune4Plus-Original/filament_petg_original.json

@@ -85,7 +85,7 @@
     "filament_flow_ratio": 0.97,
     "filament_max_speed": 0,
     "filament_minimal_purge_on_wipe_tower": 15,
-    "filament_pressure_advance": 0.030,
+    "filament_pressure_advance": 0.075,
     "filament_abrasive": 0,
     "filament_hybrid": 0,
     "filament_vendor": "Generic",