Initial commit: ESP32-C6 rack fan controller with ESPHome

3-zone PWM fan controller (intake/central/outtake) with DS18B20 temp
sensors, RPM monitoring, ST7789 LCD display, and Home Assistant
integration via ESPHome native API. USB-C PD powered.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.gitignore

@@ -0,0 +1,15 @@
+# ESPHome build artifacts
+esphome/.esphome/
+esphome/**/.pioenvs/
+esphome/**/.piolibdeps/
+
+# Secrets (never commit)
+esphome/secrets.yaml
+
+# IDE
+.vscode/
+.idea/
+
+# OS
+.DS_Store
+Thumbs.db