Add DAB ANTCAP calibration and fix BT1035 boot banner timing

Extend the FM-only ANTCAP antenna-varactor override to DAB, mirroring the
existing mechanism end to end (driver, tuner, service, EEPROM storage,
HTTP API). Live sweep on real hardware found no ANTCAP value beating
auto-tune on the ensembles tested, so DAB stays on auto-tune by default.

Also fix BT1035 boot: the module's real boot banner doesn't appear until
~18-24s after RESET# releases, not the 3.5s previously waited; add a
2-attempt retry and a baud-rate probe fallback for diagnostics.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

Software/main/CMakeLists.txt

@@ -5,6 +5,7 @@ idf_component_register(
         "web_radio_stream.cpp"
         "esp32_i2s_sink.cpp"
         "phone_stream.cpp"
+        "antenna_calibration.cpp"
         "$<$<BOOL:${CONFIG_TEST_FIRMWARE}>:test_firmware.cpp>"
         "$<$<BOOL:${CONFIG_I2S_SDATA_PROBE}>:i2s_sdata_probe.cpp>"
     INCLUDE_DIRS "."