Add Orca Slicer profiles for dual hotend setup
- process_original.json: Original Elegoo Hotend (15 mm³/s)
- process_bambu.json: Bambu Lab Hotend (23 mm³/s, steel nozzle)
- filament_pla_original.json: PLA for Original Hotend
- filament_pla_bambu.json: PLA for Bambu Hotend (+5°C, shorter retract)
- README.md: Complete documentation with installation guide
Key differences:
- Max flow: 15 vs 23 mm³/s
- Retract: 2.5mm vs 1.8mm
- Temp offset: +5°C for Bambu (steel nozzle)
- Pressure Advance: 0.027 vs 0.022
- Speeds: Higher for Bambu hotend
TODO: Add PETG, ABS, TPU, Carbon profiles
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