Add Python firmware development dependencies for IoT device support

[Copilot]

Added Python dependencies to support ESP32 and RP2350 firmware development workflows, including BLE provisioning, MicroPython deployment, and serial communication tooling.

Dependencies Added

• platformio>=6.1.0 - Embedded development platform for cross-compilation
• pyserial>=3.5 - Serial communication for device debugging
• bleak>=0.20.0 - Bluetooth Low Energy library for BLE provisioning scripts
• esptool>=4.0.4 - Espressif bootloader utility for MicroPython firmware flashing
• mpremote>=1.20.0 - MicroPython remote control for file management and REPL access

Firmware Added

• ESP32 MicroPython firmware with BLE provisioning, OLED display support, and WebREPL
• RP2350 RS485 communication firmware with PlatformIO build configuration
• QT2040 Trinkey CircuitPython utilities including serial monitor and camera scripts
• I2C scanner tool with self-deployment capabilities

All dependencies specified in firmware/requirements.txt with minimum version constraints for security and compatibility.

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