fix(xiao_s3_wio): restore environment sensor support

The [Xiao_S3_WIO] base block lost its sensor wiring when upstream
3dd6dc02 ("xiao_s3: use environment sensor manager and add sensor
role") was resolved to our side in a later merge. Only the .ini half
was dropped -- target.h/target.cpp kept the EnvironmentSensorManager,
so builds still compiled helpers/sensors with an empty SENSOR_TABLE:
no ENV_INCLUDE_* macros meant the table held only its sentinel, so
begin() scanned the I2C bus and initialized nothing and querySensors()
emitted nothing above channel 1.

Reported as an INA226 missing from channel 2 on a MQTT Observer build,
working on stock firmware. Affected every Xiao_S3_WIO env, including
the dedicated Xiao_S3_WIO_sensor role.

Restores sensor_base build_flags/lib_deps, -UENV_INCLUDE_GPS and the
PIN_BOARD_SDA/SCL defines, making the base block identical to upstream
again. Also picks up the commented rs232 pin relocation from the same
upstream commit, since 5,6 is now the I2C bus.

Flash on Xiao_S3_WIO_repeater_observer_mqtt: 42.7% -> 44.3%.

variants/xiao_s3_wio/platformio.ini

@@ -4,7 +4,9 @@ board = seeed_xiao_esp32s3
 board_check = true
 board_build.mcu = esp32s3
 build_flags = ${esp32_base.build_flags}
+  ${sensor_base.build_flags}
   -I variants/xiao_s3_wio
+  -UENV_INCLUDE_GPS
   -D SEEED_XIAO_S3
   -D P_LORA_DIO_1=39
   -D P_LORA_NSS=41
@@ -15,6 +17,8 @@ build_flags = ${esp32_base.build_flags}
   -D P_LORA_MOSI=9
   -D PIN_USER_BTN=21
   -D PIN_STATUS_LED=48
+  -D PIN_BOARD_SDA=D4
+  -D PIN_BOARD_SCL=D5
   -D SX126X_RXEN=38
   -D SX126X_TXEN=RADIOLIB_NC
   -D SX126X_DIO2_AS_RF_SWITCH=true
@@ -28,6 +32,9 @@ build_flags = ${esp32_base.build_flags}
 build_src_filter = ${esp32_base.build_src_filter}
   +<../variants/xiao_s3_wio>
   +<helpers/sensors>
+lib_deps =
+  ${esp32_base.lib_deps}
+  ${sensor_base.lib_deps}
 
 [env:Xiao_S3_WIO_repeater]
 extends = Xiao_S3_WIO
@@ -59,8 +66,9 @@ lib_deps =
 ;   -D ADMIN_PASSWORD='"password"'
 ;   -D MAX_NEIGHBOURS=50
 ;   -D WITH_RS232_BRIDGE=Serial2
-;   -D WITH_RS232_BRIDGE_RX=5
-;   -D WITH_RS232_BRIDGE_TX=6
+; RS232 bridge Pins have been relocated from 5,6 which is the i2c bus on xiao_s3
+;   -D WITH_RS232_BRIDGE_RX=3
+;   -D WITH_RS232_BRIDGE_TX=4
 ;  -D BRIDGE_DEBUG=1
 ; ;  -D MESH_PACKET_LOGGING=1
 ; ;  -D MESH_DEBUG=1