dangernoodle-io / breadboard / 24630547773

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feat: real EK79007 MIPI-DSI driver (color fill only) (#10)

Replaces the display stub with a working driver for the EK79007 panel
on the Elecrow CrowPanel P4 HMI 7.0.

- acquires MIPI PHY LDO via esp_ldo_acquire_channel
- creates DSI bus (2 lanes @ 900 Mbps), DBI panel IO, EK79007 panel
- enables backlight via PIN_BL_PWR + PIN_BL_PWM (board.h)
- bb_display_clear writes a solid rgb565 fill into the DPI framebuffer
  and esp_cache_msync's it to memory so DSI DMA reads coherent data
- show_splash / show_prov clear to blue (0x001F) / red (0xF800);
  bb_display_draw_text remains a stub pending LVGL (see B1-7 backlog)
- esp_lcd_panel_disp_on_off is intentionally ignored — the EK79007 DPI
  panel is always on after init and the call returns ESP_ERR_NOT_SUPPORTED

Verified on hardware: snugfeather boots, panel lights solid blue.

Followup: B1-8 — make hardware-specific deps opt-in so headless
breadboard consumers don't pull esp_lcd_ek79007.

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