* Add LilyGO T-Beam 1W support
- Add board definition and variant files for ESP32-S3 based T-Beam 1W
- Add RF95_FAN_EN support to SX126xInterface for PA cooling fan
- Add SX126X_PA_RAMP_US for configurable PA ramp time (800us for 1W PA)
- Configure RF switch: DIO2 for PA, GPIO 21 for LNA control
* Set TX_GAIN_LORA to 10dB per PR feedback (offset for 1W PA)
* Apply suggestion from @Copilot
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
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Co-authored-by: Ben Meadors <benmmeadors@gmail.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>