Major hardware update: toolhead switching, DC/DC protection, and documentation overhaul

Hardware Changes:
- Replaced reverse polarity protection with 2x PFET toolhead switching (PB2/PA5 control)
- Added SS56 Schottky diode reverse polarity protection for DC/DC converter
- Updated current limit resistor to 5.1kΩ (~10.2A)
- Removed fan control circuitry and JST-XH connector
- Removed internal JST-XH USB port with fuse/protection

Documentation Updates:
- Updated both README files to reflect hardware changes
- Removed all fan control references and configurations
- Updated Klipper configuration examples
- Cleaned up pinout and connector assignments
- Updated technical specifications table
- Fixed table of contents and cross-references

EWS.kicad_sch

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+		(title "EWS - Power, CANbus and USB HAT for 3D Printers")
+		(date "2025-12-03")
+		(rev "1.0")
+		(company "Eduard Iten")
+	)
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