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feat(bb_display): ssd1306 i2c oled backend with functional probe (B1-134a) (#182)

new bb_display_ssd1306 component implementing the
bb_display_backend_t vtable for ssd1306 oleds over i2c. uses
the bundled esp_lcd_panel_ssd1306 driver (no managed-component
dep). framebuffer is 1bpp, ~512 b for 128x32 / ~1 kb for 128x64;
rgb565 → mono via non-zero threshold in the blit path.

probe() is real this time — i2c_master_probe pings the configured
address (default 0x3c). returns BB_OK on ack, BB_ERR_NOT_FOUND on
nack. boards without the oled wired silently skip this backend
in bb_display_init's registry walk; ones that DO have it wired
get auto-selected even when other backends are also linked.

kconfig knobs: i2c address (0x3c/0x3d), height (32/64), bus
speed (default 400 khz), autoregister gate.

optional bb_display_ssd1306_set_i2c_bus(bus) lets a consumer that
already owns an i2c bus (sensor, asic) hand it in instead of the
backend creating its own.

no smoke env wires this today (no consumer board has an ssd1306
in BB; tm bitaxe migration validates later). EXCLUDE_COMPONENTS
on every smoke board so the component scan doesn't drag in pin
defines that don't exist.

closes the b1-134 espidf half. arduino bb_display platform shim
+ auto-detect demo (B1-139) follows separately.

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