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feat(bb_sensors): sectioned /api/sensors (fan/power/thermal) on bb_section with fan PATCH (B1-269) (#442)

- new bb_sensors component: file-scope bb_section_registry_t; registers GET
  /api/sensors (bb_section_build_get + bb_section_assemble_schema) and PATCH
  /api/sensors (bb_section_dispatch_patch)
- new /api/sensors coexists with old /api/fan, /api/power, /api/thermal routes;
  old routes deleted in PR7
- three sections: fan (PATCH-capable), power (read-only), thermal (read-only)
- fan PATCH = old POST /api/fan logic moved to section patch_fn; supports both
  raw duty_pct (no autofan) and autofan config fields (BB_FAN_AUTOFAN)
- shared emit helpers factored from old route emit fns: bb_fan_emit_section,
  bb_power_emit_section, bb_thermal_emit_section; old /api/fan|power|thermal
  handlers call the same helper (no behaviour drift while both exist)
- bb_pub_fan/power/thermal publishers keep their own flat MQTT format unchanged
- kconfig knobs: CONFIG_BB_SENSORS_AUTOREGISTER (default n) and
  CONFIG_BB_SENSORS_PATCH_BODY_MAX (default 256 bytes)
- bb_sensors in smoke SMOKE_REQUIRES + platformio.ini arduino build + native_scaffold.py
- 100% host test coverage; 2257 tests pass

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

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