Add comprehensive pin definitions for Heltec V3 (renamed to SOC_PIN_*/GPS_PIN_*)

hardware/heltec/v3/platformio.ini

@@ -11,3 +11,21 @@ build_flags =
     -DLORA_PIN_DIO1=14
     -DLORA_PIN_RESET=12
     -DLORA_PIN_BUSY=13
+    ; SX1262 RF switch and tuning
+    -DSX126X_DIO2_AS_RF_SWITCH=true
+    -DSX126X_DIO3_TCXO_VOLTAGE=1.8
+    -DSX126X_CURRENT_LIMIT=140
+    -DSX126X_RX_BOOSTED_GAIN=1
+    ; GPIO
+    -DPIN_USER_BTN=0
+    -DPIN_VEXT_EN=36
+    -DLORA_TX_LED=35
+    ; I2C (SoC pins)
+    -DSOC_PIN_SDA=17
+    -DSOC_PIN_SCL=18
+    ; GPS
+    -DGPS_PIN_RX=47
+    -DGPS_PIN_TX=48
+    -DGPS_PIN_EN=26
+    ; TX power
+    -DLORA_TX_POWER=22