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fix(display): enable direct_mode + num_fbs=2 for avoid_tearing (#12)

Hardware verification on ESP32-P4 showed LVGL task hung in wait_for_flushing
because with avoid_tearing=true the esp_lvgl_port VSYNC callback only signals
a semaphore; lv_disp_flush_ready is only called when render mode is direct_mode
or full_refresh. Additionally the default num_fbs=1 failed
esp_lcd_dpi_panel_get_frame_buffer(2, ...) inside esp_lvgl_port.

- set dpi_cfg.num_fbs = 2 to allocate 2 framebuffers for double-buffered DSI
- set direct_mode = true so LVGL writes dirty regions to both fbs and
  flush_ready is signaled correctly from the VSYNC callback

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