Pr/add nm tv 154 support

[RockBase-iot]

Summary

This PR adds support for the NM-TV-154 ESP32 dev board with a 240×240 ST7789 square display, while keeping the existing round GC9A01 supermini target fully buildable.

What changed

• Added [env:nm-tv-154] in platformio.ini with the target's pins, partition table, and build flags.
• Added NM-TV-154 pin definitions and LovyanGFX/ST7789 panel configuration (include/hardware/nm_tv_154_pins.h, include/hardware/lgfx_config.hpp, include/hardware/display_bus_policy.h).
• Added compile-time policies for square-display rendering and status layout (include/ui/nm_tv_154_policy.h, include/ui/radar_render_policy.h, include/ui/square_status.h).
• Updated the radar UI to render four-corner telemetry ( Wi-Fi, aircraft count, range, time HH:MM ) on the square panel without changing circular radar coordinates.
• Added display, time settings, Wi-Fi setup, and main-loop integration for the new target.
• Updated README with NM-TV-154 info and added a hardware photo.
• Changed the default build environment to nm-tv-154.

Verification

• Both pio run -e nm-tv-154 and pio run -e supermini build successfully.
• The existing round GC9A01 supermini behavior is preserved.
• The original supermini target can still be selected explicitly with -e supermini.

Notes

• The two planning documents under docs/superpowers/specs were intentionally left out of this PR.