Rev 0.2: Major hardware improvements and production readiness

Hardware Improvements (Thanks to shx for schematic cleanup):
- Clean up schematic organization and structure
- Set CAN transceiver Silent pin to GND for stability
- Add status LEDs (yellow: 24V/5V/3.3V, green: MCU PB4)
- Replace jumpers with solder jumpers on bottom side
- Add jumpers to output PFETs for permanent-on without firmware
- Add robust test points for 5V/GND load testing
- Add optional heatsink for DC/DC converter on bottom
- Add 10µF capacitor for MCU on 3.3V rail

Component Optimizations:
- Replace 30kΩ with 33kΩ basic part for simplified BOM
- Change DC/DC feedback: 15.5kΩ15kΩ (new output: 5.1V)
- Upgrade CAN ESD protection: NUP2105LPESD1CAN
- Increase CAN termination resistor footprint: 04020603
- Switch USB hub supply from 5V to 3.3V per datasheet

Production Ready:
- Add all LCSC part numbers and rotations
- Generate complete production data package
- Improve PCB layout and button placement
- Create comprehensive changelog documentation

CHANGELOG.md

@@ -0,0 +1,45 @@
+# Changelog
+
+> 🌍 **Languages:** [English](CHANGELOG.md) | [Deutsch](CHANGELOG.de.md)
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/).
+
+## [Rev. 0.2] - 2025-12-08
+
+### Improvements
+- **Schematic:** Cleaned up and structured (Thanks to "shx")
+- **CAN Transceiver:** Silent pin connected to GND for better stability (Thanks to "shx")
+
+### Added
+- **Status LEDs:** 
+  - Yellow LEDs for 24V, 5V and 3.3V voltage indication
+  - Green LED on microcontroller (Pin PB4)
+- **Solder Jumpers:** Replaced standard jumpers with solder jumpers on bottom side
+- **PFET Control:** Added jumpers for output PFETs - enables permanent-on without firmware
+- **Test Points:** Added robust test points for 5V and GND for load testing
+- **Heatsink:** Optional heatsink for DC/DC converter on bottom side
+- **MCU Capacitor:** 10µF capacitor for microcontroller on 3.3V rail
+
+### Changed
+- **Production:** Added all LCSC part numbers, defined rotations, created production data
+- **PCB Layout:** 
+  - Adjusted according to schematic changes
+  - Improved button positioning
+- **BOM Optimized:**
+  - Replaced 30kΩ with basic part 33kΩ
+  - Changed 15.5kΩ DC/DC feedback to 15kΩ → new output voltage: 5.1V
+- **CAN ESD Protection:** Replaced NUP2105L with PESD1CAN (better suited)
+- **CAN Termination Resistor:** Changed footprint from 0402 to 0603 for adequate power rating
+- **USB Hub:** Changed supply from 5V to 3.3V (per datasheet recommendation)
+
+### Technical Details
+- **DC/DC Output:** New voltage 5.1V instead of 5.0V due to feedback resistor change
+- **Improved Heat Dissipation:** Optional heatsink on bottom side
+- **Stable CAN Communication:** Through ESD protection upgrade and resistor optimization
+
+---
+
+> **Note:** The original documentation is in German ([CHANGELOG.de.md](CHANGELOG.de.md)). This English version is a translation for international users.